Classic square stone design man's ring beautifully created in .925 sterling silver, genuine black onyx stone and a solid 17 grams in weight. Size 12. This is a beautiful ring! Hand made in Taxco Guerrero Mexico. Taxco is a beautiful town located in the mountains of the west coast of Mexico and known as the silver capital of Mexico. Artisans from Taxco are world famous for their handcrafted jewelry.