Old CLARK & COOMBS Sterling 3 Sparkling Gems Ring sz 8

we have to offer you a vintage sterling silver and sparkling zircons? ring, from the 1940's or tabouts. The ring was made by the Clark & Coombs Company of Providence, Rhode Island, and bears their hallmark. It is also marked 'sterling'. The ring is a size 8-ish, and is quite comfy on my size 8.5 finger. T are 3 large, round faceted clear gems, individually prong set in high throned baskets. Now that I look at the small holes beneath the gems, and study the ones in the sides of the baskets, this ring may be older than the 1940's... possibly dating to the 1920's, or earlier. The stones measure 1/4" in diameter. The gal from whom I got this thought they were zircons, which is a natural earth-mined stone, very under-appreciated by the public. One of the gems, on the end, appears to have a slightly different cut from the other 2, and may be a replacement. The presentation area is 5/8" east-to-west, and the top measures 1/4" north-to-south. The baskets rise up 3/16" above the plane of the shanks. The ring weighs 2.5 grams, and is in very good vintage condition. The sterling setting has a bit of a patina going, which I left as is. Thank you for your interest, and holelr if you have any questions! :)