I believe this ring is vintage…
18ct Yellow Gold and Platinum Blue Green Sapphire and Diamond Ring.
Gemstone Specifications Approx.
1 Blue Green Sapphire
Total Weight: 0.06ct
Setting Diameter: 8.3mm
Setting Height: 4.5mm
Ring Weight: 2.7 grams
Ring Size: K 1/2
Resizing Service Offered at Small Cost
Note: Antique or vintage rings may have wear associated with the items age.