18k (750‰) grey gold ring, adorned with a cushion Burmese sapphire (3 carats approx.), and three round-cut diamonds 1900-1910

18k (750‰) grey gold ring, adorned with a cushion Burmese sapphire (3 carats approx.), and three round-cut diamonds
1900-1910
Ring size: 53
Gross weight: 4 g
With a preliminary analysis by GEM laboratory Paris no. 20231977032 from 28/03/2023 indicating:
Myanmar origin. Unheated