Lovely antique half hoop style pearl and turquoise band with closed back and amazing sculpted band. This ring is likely Georgian to early Victorian.
Tests approx. 12k gold and is not stamped or hallmarked, the pearls have some nacre loss and one of the turquoises was replaced, overall very good condition consistent with age.
Fits like a 7 , not sizeable. Widest part at the top is 7.5mm.