This is a beautiful pearl 14K Thai Princess Ring or dome ring. Designed with some restraint — they can be quite large — one pearl is seated above three rows of pearls for a total of 33 individual mounts including a tiny one on each shoulder.
The ring is marked inside the shank: 14K and TG (for Tommy’s Gems). It comes in its original silk covered box. The interior of the box says “Ryukyuan Gift Shop, Styled for Tommys Gems Bangkok”