This measure almost 2 1/4" X 3/8", at its widest, and is marked K. MIKIMOTO, TOKYO and has the Mikimoto hall mark, see photos. Please look at all photographs, as they are part of the description and ask any and all questions prior to looking. Thanks! Launched from my store - Powered by Highwire.com Track Page Views WithAuctiva's FREE CounterEvery buyer gets a MyStoreRewards invitation for cash back