Art Deco Unheated Sapphire and Diamond Tablet Ring

This is an Art Deco sapphire and diamond tablet ring. The ring is set with a central oval cut rub-over set cabochon sapphire which is surrounded by a cluster of rose and old cut diamonds in a rectangular shaped tablet setting crafted in platinum. The band has been crafted in 18ct yellow gold with a decorative under gallery. 

Condition: Used (Very Good)
Weight: 3.0 grams
Ring Size: K 1/2
Face Dimensions: 13mm x 11mm
Sapphire Dimensions: 8mm x 6mm x 4.5mm
Sapphire Treatment: Unheated
Total Diamond Carat Weight: Approx. 0.50 carats
Tested As: 18ct Yellow Gold and Platinum 
Period: Art Deco
Box: The Vintage Jeweller Ring Box