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Type of Stone : Black Onyx. Shape: Oval. Refractive Index : 1.53 - 1.54. Mohs Hardness : 6.5 - 7. 10 mm x 8 mm. Clarity : Opaque. 9 mm x 7 mm. 40 mm x 30 mm.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.