https://www.africagems.com/calibrated-onyx-emerald.html This Natural Black Onyx Gemstone in the AAA Grade, Displays a Velvety Black Color with Even Color (as image shows). This loose Black Onyx gemstone has been cut and polished to a high lapidary standard with a very good cut, symmetry and polish. Black Onyx gemstones are usually sourced from India and China and are traditionally dyed to improve color saturation and evenness.
From a day at the office to a night out in jeans and a t-shirt, the clean design of this sleek black onyx ring works with everything. Featuring a simple emerald-cut onyx against a highly polished golden wide band shank, this is pure gorgeous geometry for his hand. Richly plated in 14k gold. Sizes 8-13. Item# 57901 https://www.palmbeachjewelry.com/products/detail-Mens-Emerald-Cut-Genuine-Black-Onyx-Classic-Ring-14k-Gold-Plated-57901.cfm?utm_source=youtube&utm_medium=social