What Is Tanzanite Gemstone | Tanzanite Stone – GIA

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Tanzanite

Poised between lush blue, vibrant violet, and rich purple, exotic tanzanite is found in only one place on earth, near majestic Mount Kilimanjaro.

Tanzanite

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9.62-ct. Tanzanite. Tanzanite is sometimes cut in designer fantasy styles. - Courtesy Mark Schneider — Tanzanite is sometimes cut in designer fantasy styles. - Courtesy Mark Schneider

Award-winning Necklace. This award-winning jewelry piece features two triangular tanzanites set back to back. The stones were cut with the proper orientation and proportions to allow maximum enjoyment of their deep violet blue color. - Courtesy Tanzanite Foundation ™ — This award-winning jewelry piece features two triangular tanzanites set back to back. The stones were cut with the proper orientation and proportions to allow maximum enjoyment of their deep violet blue color. - Courtesy Tanzanite Foundation ™

Tanzanite Crystal. In this crystal direction, this tanzanite's violet-to-purple pleochroic color is evident. - Jeff Scovil — In this crystal direction, this tanzanite's violet-to-purple pleochroic color is evident. - Jeff Scovil

Blue Tanzanite. Tanzanite’s color can be a very bright, intense blue. — Tanzanite’s color can be a very bright, intense blue.

Tanzanite Ring. Tanzanite is one of the most popular colored gemstones in the world.- Courtesy Tanzanite Foundation ™ — Tanzanite is one of the most popular colored gemstones in the world.- Courtesy Tanzanite Foundation ™

29.22-carat Tanzanite Ring. This 29.22-carat tanzanite has a deep violetish blue color sometimes described as midnight blue. - Courtesy Tanzanite Foundation ™ — This 29.22-carat tanzanite has a deep violetish blue color sometimes described as midnight blue. - Courtesy Tanzanite Foundation ™

加熱処理済みのタンザナイト. タンザナイトは、（左の原石とカット石のように）茶色がかった素材で産出することが多い。加熱すると、これらの宝石は青色や紫がかった青色（右の原石やカット宝石のような）になる。 — タンザナイトは、（左の原石とカット石のように）茶色がかった素材で産出することが多い。加熱すると、これらの宝石は青色や紫がかった青色（右の原石やカット宝石のような）になる。

天然と処理された色を鑑別します。. 従来のタンザナイトは、深く紫がかった青色（左）を見せる。淡色のタンザナイトや他の淡色の宝石は、色を深めて改善するためにインクのような物質でコーティングされることがある（右）。 — 従来のタンザナイトは、深く紫がかった青色（左）を見せる。淡色のタンザナイトや他の淡色の宝石は、色を深めて改善するためにインクのような物質でコーティングされることがある（右）。

Angled grooves on freeform tanzanite.. Figure 3. Angled grooves on the base of the 27.20 ct freeform tanzanite create a dramatic sense of movement. Photo courtesy of Sonja Kreis Unique Jewelry. — Figure 3. Angled grooves on the base of the 27.20 ct freeform tanzanite create a dramatic sense of movement. Photo courtesy of Sonja Kreis Unique Jewelry.

Gem tanzanite with remarkable color and clarity.. Figure 2. The gem was cut from a 13 g rough tanzanite of remarkable color and clarity. Photo courtesy of Sonja Kreis Unique Jewelry. — Figure 2. The gem was cut from a 13 g rough tanzanite of remarkable color and clarity. Photo courtesy of Sonja Kreis Unique Jewelry.

Blue freeform tanzanite in ring.. Figure 1. This ring is set with a spectacular 27.20 ct vivid blue freeform tanzanite. Photo courtesy of Sonja Kreis Unique Jewelry. — Figure 1. This ring is set with a spectacular 27.20 ct vivid blue freeform tanzanite. Photo courtesy of Sonja Kreis Unique Jewelry.

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