Art Déco ring in platinum (850‰) and 18k yellow gold (750‰) adorned with a colombian square

Art Déco ring in platinum (850‰) and 18k yellow
gold (750‰) adorned with a colombian square
facetted emerald, 1,65 carat, between two
rectangular diamonds
Ring size: 53
Gross weight: 3,7 g
With a certificate from GEM Paris laboratory no.
20161972244-2 indicating:
Origin: Colombia
Treatments: moderate oil impregnation