A glowing blue Peruvian Opal set in 14k yellow gold on a 17'' gold chain with lobster clasp. Approximate stone size: 10mm x 9mm Mohs Stone Hardness: 5.5-6 Each piece is handmade with love in our Hudson Valley studio. In order to highlight each stone's color and vibrance most of our gemstone jewelry is backed in nickel free sterling silver. Please allow for slight variations in stone size, color and shape. Allow 14-21 business days to ship. Gold Single Strand Turquoise Necklace For Gift, Gold Single Strand Turquoise Necklace, Elegant Gold Single Strand Turquoise Necklace, Elegant Gold Turquoise Single Strand Necklace, Formal Yellow Gold Jewelry With Large Stone, Fine Jewelry Yellow Gold Cabochon Necklace, Yellow Gold Pendant Jewelry With Large Stone, Elegant Turquoise Pendant Necklace With Large Stone, Elegant Yellow Gold Turquoise Necklace Gift