Tungsten Carbide Ring Approximately 5mm (depending upon size chosen) with Black Tone with colorful Opal inlay design. High Quality Polished Tungsten wedding band, Tungsten wedding ring or Anniversary Ring for men or women. Note: This ring has an organic design, so design may vary slightly. Women's Tungsten Wedding Bands Black with Rainbow Opal Design.If you are looking for a ring that is scratch proof and forever keep its shine, then our Tungsten Carbide rings are for you. Tungsten Carbide is ranked second hardest next to diamond on the Mohs scale, diamond being a 10 followed by Tungsten Carbide as 9. Our rings will not cause skin irritations or turn your fingers green. Due to the Hardness of Tungsten, these rings can be laser engraved, but NOT hand engraved. THEY CANNOT BE RE-SIZED. Any rare minor scuffs can be easily buffed away by your local jewelry shop. (Good news! Matching couples rings in width sizes 2mm, 4mm, 6mm, 8mm, etc. may be available for this style. Please check other product listings)