Estate Jewelry Edwardian 10K Yellow Gold Black Onyx Signet Ring. US Ladies Size 7. Marked 10K. This ring could be worn by a man as a pinkie ring or by a woman as a right hand ring. We believe this ring could be engraved with an initial or other symbol. Really fine black onyx is becoming difficult to find. Last photograph shows both black onyx rings in stock in our shop. This estate ring is in very good condition. Comes in a ring box.