This is a lovely 18K White and Yellow Gold Ring. It is Hallmarked 750, London; Lion Head, Crown, with the date code of B. This indicated 18K London made, 1976. The band is 18K Yellow gold which leads up to the setting which is yellow gold at the base with the stones setting being 18K white gold. The center stone is a natural cabochon of fine turquoise which is surrounded by a halo or diamonds all stones are securely prong set and damage free. This ring is in fabulous condition with no damage or known imperfections. 

Measurements: 

Ring Size: 6 1/4- 6 1/2US 

Turquoise: 6mm x 8mm x 3.9mm 

Diamonds: 14 @ roughly 1.5mm each 

North to south of face: 11.75mm (East to West: 10.25mm) 

Circa: 1976 

Weight: 4.1 grams