These are stunning real diamond hoop earrings by Roberto Coin with ruby tips set in white gold. These have the diamonds on the inside and outside of the hoop!! These are amazing and beautiful on! Carefully crafted in 18-karat gold and finished with radiant white diamonds, these Roberto Coin hoop earrings catch the light at all angles. 18-karat white gold. Micro-pave GHSI white diamonds. Roberto Coin signature hidden 0.3 carat ruby. 1.40 total diamond carat weight. 45mm diameter. Post backs.