This is a great looking pair of Vintage Silver Tone & Purplish Reddish Mexican Opal Cufflinks, measuring approx. 3/4" X 1/2", and are not marked! Should polish / clean up nicely! Not sure if the stone ? is natural or synthetic or even if its glass, but these are absolutely gorgeous! Neat Cufflinks! Launched from my store - Powered by Highwire.com Track Page Views WithAuctiva's FREE CounterEvery buyer gets a MyStoreRewards invitation for cash back