What Is Tanzanite Gemstone | Tanzanite Stone – GIA

◂ BACK TO GEM ENCYCLOPEDIA

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

See Gem As

Tools

Research

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.

PreviousPage 2 of 2Next

This Month's

Featured Gems

reading

PERIDOT

Found in lava, meteorites, and deep in the earth’s mantle, yellow-green peridot is the extreme gem.

reading

FANCY COLOR DIAMOND

Dazzling brilliance. Captivating color. These are the planet’s most valued gems.

reading

DIAMOND

Diamonds are among nature’s most precious and beautiful creations.

reading

EMERALD

Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine.

reading

CITRINE

Citrine is the transparent, pale yellow to brownish orange variety of quartz.

View The Gem Encyclopedia

You Might Also Like

YMAL AJP

AJP®: New 5-Day Program Offered Worldwide

Learn About NextGem

GIA NextGem™ Diamond Training for Retail

Explore GIA Laboratory Promotional Offers

Explore GIA Laboratory Promotional Offers

Shop the GIA Store

Shop the GIA Store