Old Mexican sterling silver ring that is inlay set with a natural unpolished g5een and black parrot wing chrysocolla stone. Open back setting with rough stone at the back as well. It has a partial number 3 eagle stamp on the back outside of the band which tells me that it was made in Taxco, Mexico C. 1950 to 1971. Partial Mexico and 925 stamping inside. It is 3/8" wide. Weight: 8 grams.