Vintage 9ct Yellow Gold & Diamond Heart Ring. 
Petite size J with a single 1mm round cut Diamond,  
Stamped DIA, not hallmarked, however XRF tested at auction house for 9ct gold.
Band width: 1.3mm, Heart measures: 6mm x 5mm
Weight: 0.6g.

Very good preloved condition, will be sent gift-wrapped, ready to be loved again!