LARGE CUSHION SAPPHIRE SIGNET RING Set in 18K yellow gold with a cushion sapphire. Gross weight: 22.16 gr. Weight of the sapphire: 11.99 carats. Preliminary opinions from GEM Paris and LFG: Ceylon origin, no trace of heat treatment. A 11,99 carats cushion sapphire and 18K yellow gold ring. Gross weight : 22,16 gr. LFG and GEM Paris preliminary reports, in their opinion: origin Ceylon, no indication of thermal treatment.