.30 Deco Diamond & Quartz Drop Earrings in Platinum. 30 Deco Diamond Quartz Drop Earrings in Platinum. These inspiring Art Deco drop earrings feature 1. 04 carats of sparkling diamonds and natural clear quartz finished in shimmering platinum. Two clear quartz stones hang like glassy windows from each of the platinum stud backings. Two (2) old European cut diamonds are bezel set in the center of the quartzes, creating a beautiful illusion effect. At the top of the dangle earrings, a collection of