This piece reminds me of a wishbone, a simple, classy piece designed to hang from a chain or slide on an omega necklace on someone lucky. It is open on the sides and can accommodate an omega up to 10 mm or even more.
Set in 14K yellow gold (stamped), it weighs 2.4 pennyweights.
It is a Ceylon sapphire in a nice cornflower color. It measures 5.5 mm on the sides and is 2.5 mm deep, for an approximate carat weight of .55.
The pendant is about 3/4 inch long.