—Cosma Collection Clean forms showcasing the beauty of gold and diamonds. The Cosma Signet Ring is designed to emulate the diamonds shape in a solid octagon shape. Handcrafted in polished 18K gold. Engraving is available for this piece. Please make a note of desired engraving in the “Notes” box at checkout. (8 characters max) Quarter sizes are available upon request. Please make a note at checkout. Available in Yellow Gold, White Gold & Rose Gold — Platinum upon request. Please note: All our Luxury Hallmarked Signet Wedding Ring, Formal Octagon Diamond Ring, 14k White Gold Octagon Diamond Ring, Octagon Wedding Ring With Polished Finish, Formal Octagon Single Diamond Ring, Classic Gold Octagon Ring, 14k Gold Octagon Diamond Ring For Promise, Yellow Gold Octagonal Rings For Gifts, Timeless White Gold Octagon Ring