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0.74ct ANTIQUE CUT AAA BLOCK D VIOLET BLUE TANZANITE
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| Regional areas: | 3-4 business days |
| Remote areas: | 3-5 business days |
Product details
0.74ct ANTIQUE CUT AAA BLOCK D VIOLET BLUE TANZANITE 100% Natural Gemstone Guaranteed
| Weight | 0.74 Carat. |
| Gem Type | Natural Tanzanite |
| Shape | Antique/Portuguese Cut |
| Size in mm | 5.1 length 5.1 width 3.5 deep |
| Colour | AAA Violet Blue |
| Clarity | VS |
| Luster | Very Good |
| Origin | Tanzania, Africa |
| Treatment | Gentle Heat |
| Hardness | 6.5 |
| Refractive Index | 1.691 to 1.700 |
| Specific Gravity | 3.10 to 3.45 |
A bit about TANZANITE:
Tanzanite, a variety of zoisite, was discovered in the Merelani district of Tanzania near Mount Kilimanjaro in 1967. So far, all tanzanite discovery has been limited to a six kilometer strip in this area, which was divided into four blocks, labeled A, B, C and D. Block C is the only site still commercially producing rough tanzanite at this time. Almost all purple and blue varieties of the stone are the result of heat treatment. The stone is a yellowish-brown "bug juice" color when it is mined, but when heated to between 426.7-482.2 degrees Celcius, it becomes that gorgeous violet blue that is used in jewelry. The stone has never been found in another locality, so it is indeed a depleting resource. It is somewhat soft (6-7 on Mohs scale of hardness) and has a direction of cleavage along which it can be easily broken. It is desirable because of its elegant, opulent color.