Red Spinel and Diamond Gold Ring For Sale at 1stDibs red spinel jewelry Gubelin Red Spinel Diamond Ring at 1stDibs Vintage 9ct Gold Synthetic Spinel Dress Ring Rings from Cavendish Gorgeous Red Spinel Ring 19th Century Antique Gemstone England Etsy Burmese Red Spinel and Diamond Dress Ring, circa 1970 For Sale at 1stDibs. An impressive solitaire ring set with a rectangular cut red spinel stone. Measures 8x6mm. Head measures 8x6mm, depth 7. 5mm. Weight 5. 3grams. A very good heavy weight band and setting. Stamped 585, tests as 14 carat gold, overseas manufacture so no hallmarks. Size P, we can resize free of charge.