18k white gold ring four prong set with a single oval cabochon gray star sapphire, also bead set with 18 single cut diamonds. 2018 appraisal @ $5200. The ring weighs 5.8 grams and is a cast and hand finished piece. The ring is stamped 18K and features the following gemstones: Cabochon Gray Star Sapphire Measurements 12.21 by 9.26 by 7.0mm with an estimated 8.46 carat weight, color grey, tone light saturation medium and semi translucent transparency. 18 single cut diamonds measuring 1.0-1.5mm with a 0.05-0.015 carat with an estimated 0.23 cttw. clarity grade vs2-si1, color grade I-J. The ring is a size 10.