JRM Mexico Smoky Quartz 9ct large oval vintage sterling silver ring. Beautiful large faceted oval cut smoky quartz bezel set in modernist sterling silver setting. Stamped on the inside of the band JRM Taxco Mexico 925 with and eagle 3 mark. 

Acid tests positive for sterling silver. 

Gemstone tested with Presidium II gemstone tester. 

Ring measures size 6 and 1/2.