Shop › Mixed Gemstones Necklace, Yellow Opal Mixed Gemstones Necklace, Yellow Opal $68.00 Yellow Opal gems with 18k gold filled accents on a 14k gold filled chain. Also available in sterling silver. Material: Select Material 14k gold sterling silver Length: Select Length 17 inches (standard) 16 inches 18 inches Quantity: Add To Cart Added! Yellow Opal gems with 18k gold filled accents on a 14k gold filled chain. Also available in sterling silver.