18-Karat Rose Gold Opal Gemstones = Approximately 18.75 Ct. Tw. Earrings Drop Approximately 0.75In Post Backs Please Note: For Earring Pairs, Ct. Tw. Refers To The Total Carat Weight Of All Diamonds And/Or Gemstones For Both Earrings Combined. 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. Please Note: In Product Titles Ct. Tw. Refers To The Total Carat Weight Of All Diamonds And/Or Gemstones Combined.