NWT Stunning stud earrings, they start out in a fetching Robin's Egg Blue then change to include green or pink color in different lighting. Materials: S925 Sterling Silver, Round Cubic Zirconia 5A Tourmaline Measurements: Round, 8 mm gemstone Sterling Silver Tourmaline Earrings, 925 Earrings, Color Earrings, Multi-color Anti-allergy 8 Mm Round Single Gem Earrings,