Tension ring - Wikipedia, The Free Encyclopedia
Some tension rings exert up to 50,000 psi (350 MPa) on the diamond. It is not possible to exert so great a pressure on a stone with a Mohs scale of mineral hardness rating of less than 9.0. Some rings, while advertised as and having the appearance of tension rings, ... Read Article
Thursday, January 22, 2015
Black Engagement Rings Novori Diamond
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