From James Avery, this necklace features: This James Avery necklace looks great worn alone or layered with other necklaces - and pairs beautifully with the Sweetheart Gemstone Earrings and Ring.  Sterling silver Sterling red: lab-created ruby and mother-of-pearl doublet Sterling pink: lab-created pink sapphire and mother-of-pearl doublet Sterling mother of pearl: mother-of-pearl gemstone Approx. 7.8mm x 7.8mm x 3.1mm lab-created ruby and mother of pearl doublet Lobster clasp closure These stones have been layered to achieve a unique color and enhanced surface durability Avoid chemicals, cosmetics, and ultrasonic cleaners as well as contact with water, soap, steam, and extreme humidity Available in lengths of approx. 16", 18" and 20" Crafted in America using the world's finest materials.