Blue Opal Necklace Solid Gold Necklace for Women Opal Etsy 14 Karat Gold Plated Mini Synthetic Blue Opal Necklace 3.14 Carat Australian Blue Opal Set in 18 Karat White Gold Pendant For 14K Gold Opal Pendant, 12 Mm Blue Opal Gemstone. Blue Opal Jewelry Blue Opal Necklace 14K Gold Plated Over Sterling Silver Etsy 14 Karat White Gold Opal Blue Sapphire Diamond Pendant Necklace For. 16" + 2" extension 14 karat gold plated sterling silver cable chain necklace featuring a 6. 8mm bezel set synthetic blue opal fixed center circle. This necklace has a lobster clasp closure. . 925 Sterling Silver