Deco Interiors has dated this piece to the 1920s.

Diamonds are well matched and have been tested.
Head Measures: 6mm
Weight: 2.0g
Hallmarked: 18ct & Plat
Lovely pre-owned condition – overall quite clean. Setting and stones all appear in good order, some wear commensurate with age.
Size O: can be resized larger or smaller by reputable high street jewellers for circa £25-40 if required.
Shipping for this item is £8 within UK (tracked & insured) or £12 internationally.
Deco Interiors has dated this piece to the 1920s.
Deco interiors, windsor house, moreton in marsh
You can view the stock and full dealer information on the Deco Interiors Profile Page