You are looking at a lovely vintage Sapphire and diamond ring in an unusual marquise form.
The ring consists of an oval shaped faceted sapphire of approx 3 carats, in a yellow gold collet setting which sits in an open framework, attached to the remainder of the ring face through tiny platinum links. There are two collet set diamonds above and below the sapphire in the open framework, and a further 16 in the platinum face of the marquise shaped outer frame. In total these diamonds weigh 0,4 carats. The underframe and the shank are made of unhallmarked yellow metal that tests as 14KT yellow gold.
The ring is sold in excellent vintage condition with minimal signs of wear and tear.
The ring is a US size 6 1/4; UK M