What is the value of rubellite? A jewelry buyer explains the market price, appraisal standards, and the difference from pink tourmaline.
The most important factor that affects the value of rubellite is its color. In this article, we will explain the value standards of rubellite, the approximate price range, the difference from pink tourmaline and ruby, and points to be careful when purchasing and selling, based on our experience in appraisal and sales at jewelry specialty stores and primary information on gemology. This article is for those who are considering purchasing rubellite or want to know the value of their rubellite.
Takazo Saito(Selby Co., Ltd.)
Buyer for the Komehei Group's only company specializing in jewelry. In addition to supervising the e-commerce, SNS, loose, and product production departments, he is also in charge of purchasing rare stones. He specializes in determining authenticity and evaluating value, and works to protect consumers and improve market transparency by disseminating gemological information.
- Rubellite is the trade name for a deep pink to red tourmaline (mainly elbaite species) gemstone. It is thought that the color is caused by trace elements such as manganese and factors in the crystal structure.
- The biggest factor that determines value is "color." Stones with a bright red to reddish-purple color that is not too dark and that maintain their reddish color even under changing lighting are highly valued.
- Since it is a gemstone that relatively often contains inclusions, stones whose inclusions are not noticeable to the naked eye (eye-clean) tend to be rare and highly valued.
- Prices vary greatly in quality, with stones ranging from a few thousand yen per carat in domestic and international loose markets, to hundreds of thousands of yen for large, beautiful, bright red stones (this is not a guideline for purchase prices).
- When selling, the main points to check in the appraisal are ``color appearance under lighting,'' ``inclusions,'' ``size,'' and ``presence of identification.''
What is rubellite? Difference from pink tourmaline
Rubellite is the distribution name for a tourmaline (tourmaline) gemstone that has a deep pink to red color.Mineralogically, it is mainly an elbaite type of tourmaline (rarely, it is said to be a different type such as ridicoatite), and it is thought that its color is caused by trace elements such as manganese and factors in its crystal structure. The name comes from the Latin word ``rubellus'' (reddish), and pale pink stones are generally called ``pink tourmaline'', while dark, vivid red to reddish-purple stones are called ``rubellite''.
Border between rubellite and pink tourmaline
In conclusion, there is no uniform international standard for separating rubellite and pink tourmaline. The distinction between the two is a distribution convention, and in many cases, the mineral name "Natural Tourmaline" is written in identification documents provided by identification organizations. Furthermore, in the industry, it is common to refer to rubellite as ``highly saturated and medium to deep red to reddish-purple'' tones.
In addition, some red tourmaline stones may be a beautiful red under sunlight, but appear brownish under incandescent light.In the secondary market, stones that retain their reddish color and are less noticeable under warm lighting tend to be highly valued.. However, this is not an internationally uniform definition for classifying rubellite.
In the actual assessment, we check for color changes by switching between fluorescent, LED, and incandescent lighting, even for the same "red tourmaline." It is not uncommon for there to be a large difference in the appraised value of a stone that becomes brownish due to lighting and a stone that always maintains a bright reddish color, even if they are the same size and have the same clarity.
Five evaluation criteria to determine the value of rubellite
The value of rubellite is determined by five factors: color, clarity, carat, cut, identification and information disclosure, with color being the most important.The reason is that rubellite is a gemstone recognized for its rarity due to its color, ``red tourmaline.'' The main items to be checked at the appraisal site are explained below.
| standards | Highly rated | A state of declining ratings |
|---|---|---|
| ① Color (most important) | Bright red to reddish-purple. Maintains redness even when lighting changes | Too pale, darkening, brownish appearance, color sinks due to lighting |
| ② Clarity | Inclusions are not noticeable to the naked eye (Eye Clean) | Cloudiness, large cracks, inclusions that block light |
| ③ Carat | A stone that is large (approximately 3 carats or more) and has both color and transparency. | Small stones tend to have lower unit prices. |
| ④ Cut | A well-cut cut that brings out the most color | Too deep or too shallow, resulting in uneven color and darkness |
| ⑤ Identification/information disclosure | There are reliable identification documents and information disclosure at the time of sale (materials for peace of mind in transactions) | There are no documents or explanations regarding the gem type or treatment, so confirmation is required. |
① Color | Most important evaluation item
The colors that are most highly valued are bright red to reddish-purple colors that are not too dark or brownish or orange. The lighter the stone, the closer it is to being evaluated as "pink tourmaline," and conversely, stones that are too dark and appear dark will also be evaluated less favorably. As mentioned above, ``color stability,'' which maintains its reddish color even when the lighting changes, is also an important evaluation axis.
② Clarity | Stones with few inclusions that are noticeable to the naked eye are rare.
Red tourmaline is a gemstone that relatively often contains liquid or tubular inclusions. Therefore,Rubellite that has almost no inclusions that are visible to the naked eye (eye-clean) is highly rare, and tends to be highly valued if the color is similar.. Also, a characteristic of rubellite evaluation is that some inclusions are acceptable as long as the color is excellent, and color is prioritized over inclusions.
③ Carat | Larger stones with better color are rarer
Tourmaline itself is a mineral that can be found in large crystals, but there are not many stones that meet the requirements of being ``bright red, highly transparent, and large.'' As a practical experience in the distribution field, small stones tend to have low carat prices, while large stones with good color and transparency (around 3 ct or more as a guide) tend to have high carat prices.
④ Cut | Is it a cut that brings out the color?
Rubellite has the property that the color appears different depending on the shade of color (color zoning) and direction (pleochroism), so the quality of the cut greatly affects the appearance of the color. Stones that are cut to match the individuality of the stone and make the color look its best, are highly valued even in non-standard shapes.
⑤ Identification/information disclosure | Understand the scope of the identification report
It is said that rubellite stones whose color has been improved by heat treatment or radiation irradiation are in circulation (for details)Processing chapter). The certificate of authenticity is a document that shows that the stone is natural tourmaline and the characteristics that can be confirmed through inspection. However, the presence or absence of heating or irradiation is not always determined or recorded. When purchasing, be sure to check the scope of the identification report and the disclosure of processing information by the retailer.
Rubellite price market (approximate price per carat)
The price of rubellite varies greatly in quality, ranging from a few thousand yen per carat in domestic and international loose markets, to hundreds of thousands of yen for large, beautiful, bright red stones.There is no standard price for rubellite, and the price varies greatly depending on color, transparency, size, cut, and sales channel, so it cannot be determined just by the name or carat weight. The following is a reference example of price ranges found in loose retail and second-hand distribution in Japan and overseas.
| quality band | Approximate color/condition | Reference example of carat unit price |
|---|---|---|
| commercial quality | Pale/brownish/many inclusions | Several thousand yen/ct |
| good quality | Clear redness and minimal inclusions | Approximately 10,000 to 50,000 yen/ct |
| fine quality | Bright red to reddish-purple, large grains that are close to eye clean. | Approximately 50,000 to 150,000 yen/ct |
| extra fine | Bright red, eye-clean, and large grains that are stable even under lighting | Over 150,000 yen/ct |
*“Commercial,” “Good,” “Fine,” and “Extra Fine” are not internationally standardized grades, but are convenient classifications to explain quality differences. The price range is an estimate based on the retail asking price and second-hand distribution price of natural rubellite bare stone, and does not guarantee the price. Actual prices vary greatly depending on color, clarity, size, cut, sales channel, presence or absence of a certificate of authenticity, etc. The purchase price is generally lower than the retail price, and this table does not indicate the purchase price of SELBY. The exact value can only be determined by looking at the stone in person.
Three reasons why high-quality rubellite is highly valued
From the perspective of second-hand markets and distribution sites, there are three reasons why high-quality rubellite is highly valued:
- Limited proportion of high-quality stones: There are only a limited number of stones that have a deep, vivid red color, high transparency, and sufficient size.
- There is a unique demand as a red gemstone.: The appeal of rubellite is that it has a different color than ruby and it is easy to choose large grains.
- There is a big difference in quality between high-quality stones.: Stones with less brownness, darkening, inclusions, and uneven coloring have a clear price difference from stones of general quality.
In actual appraisals, there are cases where a stone that was purchased in the past as pink tourmaline can be evaluated as rubellite by current standards. On the other hand, even if a stone is sold as ``rubellite'', if it has a strong brownish tinge under lighting, it will not be appreciated. An important point to keep in mind when considering selling a stone is that it is evaluated based on the color of the stone itself, rather than the name at the time of purchase.
Price range varies greatly depending on quality. To be sure, you can compare it with the actual rubellite on sale or evaluate the stone you have.
Differences between ruby, pink sapphire, and spinel
Rubellite is a completely different mineral from ruby, pink sapphire (all corundum), and red spinel, and can be clearly distinguished by its refractive index, hardness, and inclusion characteristics.They are easy to confuse because they look similar, but identification organizations can tell them apart through standard tests. Historically, there is a known case where a gemstone called "Caesar's Ruby" was passed down to the Russian imperial family, but later research revealed it to be rubellite (red tourmaline), which proves that they are so similar in appearance.
| Item | rubellite | ruby | pink sapphire | red spinel |
|---|---|---|---|---|
| mineral species | Tourmaline (mainly elbaite) | corundum | corundum | spinel |
| mohs hardness | 7〜7.5 | 9 | 9 | 8 |
| Refractive index (approximate) | Approximately 1.62~1.64 | Approximately 1.76-1.77 | Approximately 1.76-1.77 | Approximately 1.72 |
| birefringence | Yes (relatively large) | Yes (small) | Yes (small) | None (single refraction) |
| Main coloring factors | manganese etc. | chrome | Chromium etc. | Chromium etc. |
| Price range trends | Easier to obtain than Ruby if the quality is the same | One of the finest colored stones | expensive | Rating has increased in recent years |
Points of focus for distinguishing at the appraisal site
In addition to equipment such as refractometers, jewelry specialty stores will also use the following characteristics to assist in the identification:
- dichroism: Tourmaline has a relatively strong property (pleochroism) in which the color intensity changes depending on the viewing direction.
- Doubling due to birefringence: When looking inside with a loupe, the ridges of the facets may appear double.
- Type of inclusions: Rubellite is said to have characteristic liquid and tubular inclusions, which are different from ruby's silk inclusions (acicular rutile).
Attention:These are for reference only. To determine the final gem type, be sure to check the identification report from a reliable identification organization both domestically and internationally. Self-judgment using only the naked eye or a magnifying glass can lead to misunderstandings.
Main production areas and characteristics
The main producing areas of rubellite are Brazil, Mozambique, Nigeria, Madagascar, and Afghanistan.Brazil is well known as a source of high-quality rubellite, but its actual value is determined more by quality such as color, clarity, and size than by the name of the place of origin. Rubellite is known to be produced in a rock called pegmatite, and its color tone and inclusions vary depending on where it is produced.
| Production area | Distribution characteristics |
|---|---|
| Brazil (Minas Gerais, etc.) | A typical production area for high-quality rubellite. Known for its beautiful bright red stones |
| mozambique | One of the important sources of supply in recent years. Also produces high quality stones |
| nigeria | Known for its large supply since the late 1990s |
| madagascar | A place where a variety of tourmalines are produced, including red varieties. |
| Afghanistan/Pakistan | High-quality crystals are produced from pegmatite deposits. |
| Russia (Ural region) | Historical production area. Known for the Imperial Collection ``Caesar's Ruby'' |
*Unlike ruby and Paraiba tourmaline, rubellite has a limited ``locality premium'' where the price is greatly influenced by the locality itself. Even in the second-hand market, the color and quality of the stone itself is given priority over the place of origin.
Processing (heating/irradiation) and fake/similar stones
Rubellite is said to be a stone that has been heat-treated or irradiated to improve its color.It is believed that irradiation can intensify the redness of pale stones, and it has been reported that these treatments may be difficult to detect with normal identification tests. For this reason, the treatment may not be definitively stated in the identification book, and it is important to understand this as a property of the gemstone tourmaline.
How does processing affect value?
Clear "untreated premiums" such as ruby's unheated premiums are still limited in the general distribution of rubellite. The reason is that, as mentioned above, it may be difficult to determine whether processing is being performed or not. In the second-hand market, the reality is that cars are evaluated based on ``how beautiful the current color is'' rather than the estimated treatment. On the other hand, in the high-end loose market, stones that come with analysis reports on origin and processing may have added value.
Fake/similar stone patterns
The following patterns exist for ``items thought to be rubellite'' that are actually encountered at appraisal sites.
- Glass (imitation stone): Air bubbles etc. may be observed, but it cannot be determined just by the presence or absence of air bubbles, and must be determined by inspection by an identification organization.
- Synthetic ruby/synthetic sapphire: An example of an old piece of jewelry that was thought to be a "red stone = ruby" but was actually synthetic corundum.
- garnet red spinel:Confusion between natural stones. Both are single refractive and have different optical properties from tourmaline.
- Tourmaline with insufficient processing information:There are cases where the explanation at the time of sale is not sufficient regarding the presence or absence of processing and detectability. Treated natural tourmaline is not an imitation, but the description of the treatment information is relevant to your purchasing decision.
In practice, there are many cases in which a red stone brought in by a customer as a "ruby" turns out to be rubellite after identification. Some people may be disappointed, but if the color and quality are good, it will be highly evaluated as rubellite. On the other hand, it would be a waste if you decided on your own that ``it's cheap because it's tourmaline'' and gave up on selling it.
Points to note when purchasing
When purchasing rubellite, there are three basic things to keep in mind: ``Check the color under multiple lighting conditions,'' ``Check the location of inclusions,'' and ``Check if there is an identification document.''Because color is the jewel of life, we recommend that you check the color in an environment close to natural light, if possible, rather than making judgments based solely on the lighting in the store.
Figure 12: Pre-purchase checklist
- We checked whether the redness was maintained under both white lighting and warm lighting.
- Checked if there were any visible inclusions or cracks when viewed from the front.
- Checked to see if there were any cracks on the edge of the stone (near the girdle) (affecting durability)
- I checked to see if a certificate of differentiation (a document showing the test results with natural tourmaline) was included.
- We confirmed the basis for the "rubellite" label (color standards) with the retailer.
- I compared and considered whether the size and price were reasonable as a carat price.
In addition, rubellite has a Mohs hardness of 7 to 7.5, which is hard enough to withstand everyday use, but it is not as hard as ruby or sapphire, and stones with many inclusions require attention to impact. If you plan to use the ring every day, you can also choose a design that protects the stone, such as a ring clasp. Do not use ultrasonic cleaners or steam cleaners on tourmaline; instead, wash it gently with warm water and mild detergent, then wipe dry with a soft cloth.
Points of sale/appraisal
The most important feature of rubellite sales is that ``the quality of the stone is directly reflected in the appraised value,'' and even unbranded jewelry can receive a good evaluation if the stone is of good quality.Since the evaluation of the stone is added to the value of the precious metal, keeping the following points in mind in advance will help you sell with a sense of satisfaction.
Four points that affect the appraised value
- Is there a certificate of identification or an analysis report?:If you have a certificate showing that it is natural tourmaline, the appraisal will be smoother and the reliability will be increased at the time of resale. Appraisal is possible even if lost.
- stone condition:Surface scratches and chips will affect the evaluation. However, it is safe to submit the item as is for evaluation without attempting to polish or clean it yourself.
- Condition as jewelry: Metal engraving (K18, Pt900, etc.), design, and presence or absence of a brand are also included in the overall evaluation.
- Choose an appraiser that specializes in colored stones:For colored stones like rubellite, the value of the stone may not be fully evaluated at purchasing stores that mainly focus on bullion. It is important to choose a store that has an appraiser with expertise in jewelry.
Jewelry specialty stores evaluate rubellite based on whether it can be resold as a colored stone. There can be a big difference in price for the same item between an appraisal based solely on the bullion value and an appraisal that evaluates the stone's color, size, and market demand. When getting competitive estimates from multiple companies, you can find out the expertise of the appraiser by asking them how they evaluated the stone.
Frequently asked questions (FAQ)
Q1. What is the difference between rubellite and pink tourmaline?
Both are the same tourmaline (mainly elbaite species), and are classified according to the depth and brightness of the color. The deep, vivid red to reddish-purple color is called rubellite, and the pale pink color is called pink tourmaline. There is no uniform international standard, and identification documents generally list it as ``natural tourmaline.''
Q2. Is rubellite less valuable than ruby?
Generally speaking, rubies are traded at a higher price range if they have the same appearance. However, even large pieces of rubellite are available at a price range that is easy to obtain, so if you are looking for a "large, beautiful red gemstone," rubellite is often a better choice, so it is not a simple upper and lower relationship.
Q3. What color is the most valuable rubellite?
It is a medium to dark colored stone that is bright red to reddish-purple without any brownishness, and is neither too bright nor dark. Furthermore, stones that have ``color stability'' that retain their reddish color under both white and warm lighting are particularly valued. Stones that turn brown when exposed to lighting will be evaluated lower even if they are of the same density.
Q4. Will the value decrease significantly if there are inclusions?
Rubellite is a gemstone that relatively often contains inclusions, so some inclusions are tolerated and the beauty of the color is given priority when evaluating it. However, cloudiness or large cracks that are visible to the naked eye will lower the evaluation. On the other hand, stones with almost no visible inclusions (eye clean) are rare and tend to be highly valued.
Q5. Does heat treatment or irradiation treatment affect the value?
It is said that it may be difficult to detect processing in rubellite, and clear unheated premiums like ruby are limited in general distribution. In the used market, the beauty of the current color is the focus of evaluation rather than the estimated processing. At the high end of the market, stones with analysis reports may be an added value.
Q6. Can I sell it without a certificate of authenticity?
It's possible. A purchasing store with specialized knowledge of jewelry can inspect and appraise the item on the spot. However, if you have a certificate of authenticity, it will be easier to confirm that it is natural tourmaline, and the appraisal will be more transparent, so please be sure to bring it with you if you have it.
Q7. Are small rubellites and side stones eligible for purchase?
Although it is available for purchase, small stones tend to have low carat prices, so the evaluation of individual stones may be limited. In this case, it will be a comprehensive appraisal that includes the value of the bullion and the overall design of the jewelry. We recommend that you submit it for an appraisal and check it first.
Q8. Does rubellite fade or change color?
Tourmaline is generally considered to be stable to light. However, please avoid high temperatures or sudden temperature changes as this may cause discoloration or damage. Also, do not use ultrasonic cleaners or steam cleaners, and instead clean with lukewarm water and neutral detergent.
Q9. Are there any fake Rubellite products? How to tell the difference?
There is confusion with glass imitation stones, garnet, spinel, synthetic corundum, etc. Tourmaline has unique optical properties such as birefringence and pleochroism, so it can be identified through inspection by an identification organization. It is difficult to judge with the naked eye, so if you have any doubts, we recommend that you have it checked out.
Q10. Which month's birthstone is rubellite?
Tourmaline is the birthstone for October, and rubellite is also considered one of them. Opal is also a birthstone for October, and rubellite is a popular choice for birthstone jewelry for those who prefer gorgeous red colors.
Q11. What is the purchase price of rubellite?
There is no uniform market price because of the large differences in quality, but as a reference example, large stones with excellent color and transparency can be valued at hundreds of thousands of yen. On the other hand, for light-colored and small-grained stones, the evaluation may center on the base metal value. Please check the actual appraisal for the exact amount.
Q12. Where is the best place to sell?
We recommend a purchasing store specializing in jewelry that has a resale route for colored stones. This is because it may be difficult for the value of the stone to be reflected in the evaluation at a purchasing store that focuses on bullion. Obtaining competitive estimates from multiple companies and choosing an appraiser who can explain the evaluation of the stone itself will lead to a sale with a sense of satisfaction.
Summary｜Color is the most important factor in the value of rubellite
Rubellite is the trade name for a tourmaline gemstone that exhibits a deep pink to red color, and its value is most influenced by its color. The stones are highly rated in the second-hand market for their bright red to reddish-purple color without browning, the stability of the redness even under lighting, the lack of inclusions that are noticeable to the naked eye, and the large size of the stones.
When purchasing, be sure to check the color under multiple lights and check the identification certificate, and when selling, be aware of choosing a specialty store that can accurately evaluate colored stones. Rubellite is a gemstone whose value can be maximized by selecting it with the right knowledge and taking it to the right appraiser.
As a jewelry specialty store, we check the quality of all the rubellites we sell before introducing them to you. The evaluation of your rubellite is free of charge. We will also explain the evaluation details of the stone.
Related articles
- Values and types of tourmaline | Explaining the difference in price depending on color
- What is Paraiba Tourmaline? Value and how to tell
- Pink sapphire value and how to choose it
- Ruby appraisal standards and purchase price
- Basic knowledge to sell colored stones at a high price
Reference materials
- GIA (Gemological Institute of America) “Tourmaline Quality Factors”
- GIA “Gem Encyclopedia: Tourmaline”(Explanation on the properties and processing of tourmaline)
- International Gem Society “Rubellite Jewelry and Gemstone Information”
- Gem-A (British Gemological Institute) Explanatory article about tourmaline
- Mindat.org"Elbaite/Rubellite" (mineralogical data)
- Selby Co., Ltd. Appraisal and sales practice data (based on experience in the used market)
This article was created based on primary gemological information and Selby Co., Ltd.'s practical experience in appraisal and sales. The price information is a guideline and does not guarantee the actual sales price or appraised value.