This is a gents Initial "K" signet ring. The  ring is sterling silver with a genuine onyx stone that was purchased by our family jewelry store sometime in the 1970's and was not purchased (no previous owner). The square onyx stone is 10mm by 8mm. the initial "K" is 5mm by 5mm. The weight of the ring 5.4gr and size 12. A very elegantly styled ring!