Orange Sapphire Brooch 18kt Yellow Gold. The ladies floral pin measures 2 1/2″ high x 1 ¾” wide and at the base of the lip is an oval orange sapphire (0.65cts), epoxy set. This brooch was fabricated with a bright polish and textured finish and comes with an insurance appraisal of $3100.00. It is marked RC ; 18kt.