Vintage Mexican Sterling Silver Green Onyx Bracelet, Hallmarked 18 Vintage Mexican Sterling Silver Green Onyx Delicate Bracelet 18.0 Grams Jewelry Vintage Sterling Silver 925 Mexico Bracelet Black Onyx Poshmark Vintage Mexican Sterling Silver Green Onyx Bracelet Etsy Vintage Mexican Sterling Silver Green Calcite stone Bracelet 3 Etsy. Beautiful vintage Mexican Sterling Silver bracelet set with oval green onyx stones. This is a very pretty piece with a silver stripe running through the center of the stone. This piece is a delicate, link style with a box closure. HALLMARK: Heco en Mexico, Plata., CMR, it is hard to read the entire hallmark. MEASUREMENTS: 7" L interior, 7 1 2" with clasp, 1 2" W CONDITION: Excellent. Signs of wear appropriate to the age of the piece. MATERIAL: Sterling Silver, green onyx. GRAMS: 18. 0 Domestic Shipping: Priority Mail including free tracking and insurance. RETURNS POLICIES: All vintage items are FINAL SALE. We try to give accurate descriptions for each item. We are a smoke free environment. Our items are vintage, only one for sale. Thank you for visiting Papillon Vintage Shop.