I am always pleased to come upon an iconic vintage ring. Here you have a three stone 18 KW gold filigree ring with @0.16 CT Princess Cut Sapphire and two Old European Cut Diamonds @0.30 CT total. The ring is size 5.5 and weighs 2.1 grams. It could be sized by your local jeweler.
The Sapphire is a well saturated with great translucency. The Diamonds are well matched although one is VS2 and the other is an I. Excellent estate condition with a pleasing detailed filigree mount. Nice! From the 1920's.