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Tanzanite is the blue and violet variety of the mineral zoisite (a calcium aluminium hydroxyl sorosilicate), caused by small amounts of vanadium. [3] Tanzanite belongs to the epidote mineral group. Tanzanite is only found in Simanjiro District of Manyara Region in Tanzania , in a very small mining area approximately 7 km (4.3 mi) long and 2 km ...
The discovery of diamond-bearing kimberlites in the 1870s in Kimberley sparked a diamond rush, transforming the area into one of the world’s largest diamond-producing regions. Since then, the association between kimberlites and diamonds has been crucial in the search for new diamond deposits around the globe. [22] [23]
Here’s what you need to know on how to find the value of a diamond. ... Diamond Price Range. Diamond Weight. Price per carat. Diamond Price Range. 0.50 Carat. $1,100 – $7,690. $500 – $3,485.
This is a partial list of the largest non-synthetic diamonds with a rough stone (uncut) weight of over 200 carats (40 grams). [1] The list is not intended to be complete—e.g., the Cullinan (formerly Premier) mine alone has produced 135 diamonds larger than 200 carats since mining commenced.
In the United Kingdom the original Board of Trade carat was exactly 3 + 1647 ⁄ 9691 grains (~3.170 grains = ~205 mg); [ii] in 1888, the Board of Trade carat was changed to exactly 3 + 17 ⁄ 101 grains (~3.168 grains = ~205 mg). [iii] Despite it being a non-metric unit, a number of metric countries have used this unit for its limited range of ...
It is translucent and brownish-yellow and has an index of refraction of 2.40–2.41 and a specific gravity of 3.2–3.3 . Its hardness is theoretically superior to that of cubic diamond (up to 58% more), according to computational simulations, but natural specimens exhibited somewhat lower hardness through a large range of values (from 7–8 on ...