Saturday, 3 December 2016

Tsavorite Garnet

Tsavorite is a variety of the garnet group, a calcium-aluminium garnet with the formula Ca3Al2Si3O12. Trace amounts of vanadium or chromium provide the green color. Green colors of tsavorite and demantoid overlap, but they are different garnet group minerals. Tsavorite is green grossular and demantoid is green andradite. Andradite is softer than grossular with a higher refractive index and higher dispersion.

The name tsavorite was created by Tiffany in honor of Tsavo East National Park in Kenya. Apart from Tanzania it is also found in Madagascar. Small deposits of gem grade material have been found in Pakistan and Queen Maud Land, Antarctica. No other occurrences of gem material have been discovered.
Tsavorite Garnet is a rare gem that has begun to challenge emerald as the finest of the green gemstones. Unlike emerald, tsavorite is always untreated. It has more brilliance than emerald due to its higher refractive index.

Tsavorite garnets over 2 carats are very rare, and fine stones over 4 carats are exceptionally rare. Colors range from mint green to a deep chrome green.
Tsavorite garnets are famed for their brilliance. Their eye-catching radiance and favourable properties for setting in jewellery makes them highly desirable gems.