5.33 cts Natural Pear-cut FancyGreen VVS ChromeTourmaline (Brazil)

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Seller: gemgym ✉️ (133) 0%, Location: Los Angeles, California, US, Ships to: WORLDWIDE, Item: 231665926148 5.33 cts Natural Pear-cut FancyGreen VVS ChromeTourmaline (Brazil).

5.33 cts Natural Pear-cut Fancy Green VVS Chrome Tourmaline (Brazil)

New without Tags.  This gem has never been used/placed/set in a setting.  It is utterly undamaged, unmarred and in perfect condition as expected of NWOTags.

I have included a Tourmaline article below for your appreciation and education.

Summary of below:  "Chrome tourmaline is a rare, gemstone quality variety of chromium-bearing green dravite. Dravite is one of several specific varieties of the tourmaline group. Although dravite tourmaline is quite common in occurrence, most deposits are too opaque or too heavily included to be of any gemstone value. Chrome tourmaline, or chrome dravite, owes its color to traces of chromium, the same element responsible for red ruby and green emerald. Chrome tourmaline may also contain vanadium, another coloring agent commonly found in both emerald and tsavorite garnet . Chrome tourmaline is highly-prized for its distinct, rich forest-green color and is considered a collector's gem, but not because it lacks the hardness and durability for jewelry, but because of its extreme rarity in occurrence. Unlike other varieties of tourmaline, chrome tourmaline is rarely found in large sizes, in fact, most stones weigh less than a single carat."   ....   "Chrome tourmaline is not known to be heated, treated or enhanced in any way. In fact, most tourmaline is completely unenhanced. However, some specific varieties of tourmaline may occasionally be heated or irradiated to improve color and clarity."

Type:  Natural Tourmaline  (personally confirmed as Genuine Tourmaline by digital refractometer (RI=1.658), dichroscope (dichroic), polariscope (four flashes in rotation; not glass), spectroscope, UV short&long-wave light, measured Specific Gravity=3.18) -- gemgym Color:  Chrome Green  "Tourmaline exhibits strong pleochroism, which means its crystals can exhibit different colours depending on the angle from which they are viewed." Shape:  Pear-cut Dimensions:  11.95mm x 10.11mm x 7.85mm Weight:  5.33 cts Luster:  Gorgeous Clarity:  VVS  "Green tourmaline is often eye-clean, while blue, red and  pink tourmaline , including rubellite, paraiba and watermelon tourmaline, are almost always found with significant inclusions." Hardness:  7.5 rating on the Mohs Scale Treatment:  Not Heated, Not Treated, Not Enhanced (tourmaline is typically not heated nor treated)  --  gemgym Origin:  Brazil

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Chrome Tourmaline Gemstone Information About Chrome Tourmaline - History and Introduction

Chrome tourmaline is a rare, gemstone quality variety of chromium-bearing green dravite. Dravite is one of several specific varieties of the tourmaline group. Although dravite tourmaline is quite common in occurrence, most deposits are too opaque or too heavily included to be of any gemstone value. Chrome tourmaline, or chrome dravite, owes its color to traces of chromium, the same element responsible for red ruby and green emerald. Chrome tourmaline may also contain vanadium, another coloring agent commonly found in both emerald and tsavorite garnet . Chrome tourmaline is highly-prized for its distinct, rich forest-green color and is considered a collector's gem, but not because it lacks the hardness and durability for jewelry, but because of its extreme rarity in occurrence. Unlike other varieties of tourmaline, chrome tourmaline is rarely found in large sizes, in fact, most stones weigh less than a single carat.

Chrome tourmaline is found only in Tanzania and is often associated with green tsavorite garnet , a very rare and valuable variety of garnet. Tsavorite is also found solely in Tanzania and is often mined from the very same location as chrome tourmaline. Contrary to most beliefs, there are surprisingly very few gemstones that naturally occur in green; subsequently, even fewer are colored green by chromium. The color of chrome tourmaline is said to rival that of the finest emerald and tsavorite, but is much more affordable. Its color is very similar to chrome diopside , another chromium-colored green gemstone, but chrome tourmaline is significantly harder and is therefore much more durable for jewelry use.

Chrome tourmaline exhibits a remarkable level of dichroism, which means that a single stone can exhibit two colours when viewed along different axes. Pleochroism can result in a single stone reflecting two or more different colors, or depths of color and color intensity, depending on the angle from which it is viewed. Another very interesting property of chrome tourmaline is its ability to carry a small electrical charge when subjected to mechanical stress, pressure or extreme temperature fluctuations. These properties are referred to respectively as piezoelectricity and pyroelectricity, and in many cases, can be so pronounced that crystals can even attract small bits of paper, straw or wood. Piezoelectricity and pyroelectricity are fascinating properties that are known to exist in only a handful of different types of gems, which include rare axinite , prehnite and also in chalcedony quartz .

Chrome Tourmaline
Identifying Chrome Tourmaline

Chrome tourmaline can be easily distinguished from other varieties of green tourmaline by the presence of chromium. Testing for chromium content is typically done using a specialized filter, known as a 'Chelsea filter'. A Chelsea filter will show flashes of red or orangey red when viewing chromium-rich stones. In many cases, scratch testing can help identify chrome tourmaline among other similar green materials, such as chrome diopside , sapphire and spinel. It is considerably softer than sapphire and spinel , but significantly harder than any diopside .

Tourmaline crystals are doubly refractive to a high degree, which can help with identification. Chrome tourmaline crystals are long, columnar and trigonal, and typically triangular in cross-section. It is through these distinct three-sided prisms that chrome tourmaline can be easily distinguished, simply because no other commonly occurring mineral is known to exhibit such distinct three-sided forms as tourmaline.

Chrome Tourmaline Origin and Gemstone Sources

Chrome tourmaline is found only in Tanzania, which is also the world's only source for tanzanite and tsavorite. Chrome tourmaline and tsavorite are often sourced from the same mines, but miners tend to focus more on tsavorite, owing to its higher profitability. Tanzania is also very well-known for its abundance of fine sapphire, spinel, zircon , chrysoberyl and chrysoprase .

Buying Chrome Tourmaline and Determining Chrome Tourmaline Gemstone Value

Chrome Tourmaline Color

Chrome tourmaline occurs with an attractive, medium-rich, forest-green color. The primary green color is often accompanied by secondary hues of either yellowish or bluish tones. Blue hues are best viewed under incandescent light, whilst yellows are best viewed under daylight. Bluish materials are considered more valuable, and unlike emerald, there can never be too much blue in chrome tourmaline.

Chrome tourmaline color tends to darken with larger stones, often exhibiting near-blackish tones. Some specimens may even appear opaque. The color is deepest along the main axis of tourmaline crystals, which means that precise orientation of cut is required in order to achieve the optimum color.

Chrome Tourmaline Clarity and Luster

Most tourmaline gemstones are naturally included and typically found with visible fractures and needle-like inclusions, but chrome tourmaline is prized for its excellent transparency and is typically found with very few inclusions, most often being eye-clean. Chrome tourmaline has an extremely attractive, vitreous to slightly resinous luster once cut and polished.

Chrome Tourmaline Cut and Shape

Chrome tourmaline is strongly dichroic, making the quality of cut very important in order to highlight the best and lighter of colors. This is done through the careful orientation of cut. In order to achieve the best color, the table facet must be cut perpendicular to the c-axis, which commonly results in shapes such as long bars, baguettes and octagon or emerald cuts.

Other common shapes include cushion, round, oval, pear and triangular (trillion) shapes. These shapes tend to bring out the best in color, while also maximizing the rough carat weight. Chrome tourmaline is most often faceted to bring out color and brilliance, but on occasion, it may be cut en cabochon (typically only lower grade materials).

Chrome Tourmaline Treatment

Chrome tourmaline is not known to be heated, treated or enhanced in any way. In fact, most tourmaline is completely unenhanced. However, some specific varieties of tourmaline may occasionally be heated or irradiated to improve color and clarity.

  • Condition: New without tags
  • Condition: Chrome tourmaline is a rare, gemstone quality variety of chromium-bearing green dravite. Dravite is one of several specific varieties of the tourmaline group. Although dravite tourmaline is quite common in occurrence, most deposits are too opaque or too heavily included to be of any gemstone value. Chrome tourmaline, or chrome dravite, owes its color to traces of chromium, the same element responsible for red ruby and green emerald. Chrome tourmaline may also contain vanadium, another coloring agent commonly found in both emerald and tsavorite garnet. Chrome tourmaline is highly-prized for its distinct, rich forest-green color and is considered a collector's gem, but not because it lacks the hardness and durability for jewelry, but because of its extreme rarity in occurrence. Unlike other varieties of tourmaline, chrome tourmaline is rarely found in large sizes, in fact, most stones weigh less than a single carat.
  • Total Carat Weight (TCW): 5.33 cts
  • Natural/Lab-Created: Natural
  • Color: Fancy Green
  • Shape: Pear
  • Treatment: Not Heated, Not Treated, Not Enhanced
  • Country/Region of Manufacture: Brazil
  • Gemstone Type: Tourmaline

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