![]() Black Onyx stone with pure black color shade costs higher than those with lighter black or greyish shade. Color : ‘Onyx black color’ is the most famous variety of Onyx and the most common black gemstone.Black Onyx price per carat can range from Rs 100 per carat to Rs 500 per carat. Black Onyx Price can go up depending on a few factors like the cut, clarity and size of the stone. ![]() While it won’t go down in price too much when treated, there is a slight decrease in price. ![]() Black Onyx Value depends on whether it’s been treated or remained natural.
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