This is an authentic, pre-owned piece. It's possible that there may be some gentle wear. 18-karat white gold Diamond = approximately 0.50 ct. tw. Ruby gemstones = approximately 0.82 ct. tw. Earrings drop approximately .5in Post backs It is customary to treat most gemstones to achieve enhanced color and durability. Some of these treatments may not be permanent, and may require special care.