Edwardian Old Mine Cut Three-Stone Diamond Trefoil Ring

Edwardian three stone ring in the form of a trefoil.  Three transitional old mine cut diamonds with an approximate total carat weight of 1.75 carats. The larger weighing .75 carats and the two smaller, approximately .5 carats each.  Set in platinum on 18k gold.  English in origin, found in London. Circa 1900. 

Size 5 3/4, sizable.