An antique diamond single-stone ring, circa 1890, the old brilliant-cut diamond gypsy-set in a plain polished mount, the inner hoop engraved 'Les Artistes a Leur Regis Et Ami E.R. Novembre 1893', mounted in 18 carat yellow gold, diamond weighing approximately 0.84 carat, gross weight 7.1 grams, ring size M