Mauboussin Paris Yellow Sapphire Diamond Gold Ring

Mauboussin Paris Unheated Yellow Sapphire Diamond Gold Ring 
Vintage 18K yellow gold yellow sapphire and diamond ring, size 6.5. French hallmark. It comes with gemological appraisal certificate. 
Natural Unheated Sapphire Weight: 4.50 Carat. 
Diamond Weight: 1.5 Carat, Clarity: VS, Color: G-H.