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Stone | Refractive Index | Specific Gravity | Hardness | Toughness | Enhancements | Enhancement Frequency | Enhancement Stability | Care Tip | Birthstone Month | Anniversary Year |
|---|---|---|---|---|---|---|---|---|---|---|
Tanzanite | 1.691-1.700 (+/- 0.005) | 3.35 (+ 0.10, - 0.25) | 6.7 | Fair to Poor | Heated to produce violet blue color | Always | Excellent | Avoid sudden temperature changes and ultrasonic cleaning | December | 24th |
Anniversary Year(s):
24th
Birthstone Month:
December
Care Tips:
Avoid sudden temperature changes and ultrasonic cleaning
Enhancement Stability:
Always
Enhancement Frequency:
Always
Enhancements:
Heated to produce violet blue color
Toughness:
Fair to Poor
Hardness:
6.7
Specific Gravity:
3.35 (+ 0.10, - 0.25)
1.691-1.700 (+/- 0.005)
Refractive Index:
Tanzanite
Birthstone for the Month of:
December
Named for its country of origin, this vivid violetish blue variety of the mineral species zoisite burst onto the gemstone scene in the late 1960's. Smaller stones tend toward lighter tone while larger stones typically display deeper color. Tanzanite is always heated to permanently change its color from brown to its signature violet/blue.
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