- Countess Oval Shape Blue Topaze & Double Diamond Halo Ring in 14k Gold 2-Tone Yellow & WhiteUS$ 938.00Total diamond weight .32ctLeonora Blue Topaz and Diamond Halo Ring in 14K White Gold RingUS$ 750.00Total diamond weight .18ct10K White Gold Diamond Halo Oval Amethyst Birthstone Ring For WomenUS$ 262.00Total diamond weight .03ct