- Metal: Solid gold(9K/14K/18K white/yellow/rose gold),925 sterling silver, platinum available- Main Stone: 6.5mm round lab opal- Accent Stone: diamonds or moissanites- Chain: 16+2 inches. The chain can be adjustable to 18 Inches.- Can be personalized: Yes Elegant Opal Jewelry With Round Stone, Elegant Round Stone Opal Jewelry, Elegant Round Opal Jewelry, White Gold Opal Round Necklace, Gold Opal Jewelry With Prong Setting, Elegant Opal Round Pendant Jewelry, Elegant Round Opal Pendant Jewelry, Elegant Opal Pendant Jewelry, Gold Opal Jewelry With Round Cut