This is a great looking Pendant, measuring approx. 3/4", at its widest (not including the loop), and is not marked, but Mercury Dimes are made out of coin silver (900 parts rather than sterling which is 925 parts) and chain is marked STERLING. Please see pics! Photos constitute part of the description! Please 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