Imported. 18K yellow gold/18K rose gold/sterling silver/amethyst/clear quartz/green amethyst/rose quartz. IPPOLITA Rosé is a unique alloy of 18K gold and sterling silver, plated with 18K rose gold. 16-18" Adjustable. Lobster clasp. Gemstone Treatment and Care. Almost all gemstones and black diamonds have been treated to enhance their beauty and require special care. Photo may have been enlarged and/or enhanced.