London Blue Topaz and Diamond Halo Ring Blue Topaz 3.8 ct. Diamond 0.43 ct. 18K White Gold Other Products. Diamond Ring Diamond 1.01 ct. GIA Certified G VVS2 3 Excellent Pave Diamond 0.08 ct. 18K White Gold More Detail Solitaire Ring Diamond 0.82 ct. GIA Certified G VVS2 3 Excellent 18K White Gold More Detail Diamond Ring Diamond 0.18 ct. Pave Diamond 0.13 ct. 18K White Gold More Detail