Art Nouveau emerald and diamond crossover ring. Set with a kite shape step cut natural emerald with no color enhancement and minor clarity enhancement to center in an open back claw setting with an approximate weight of 2.00 carats, further set with twelve round rose cut diamonds in open back grain settings with an approximate combined weight of 0.40 carats, to a smoothly conforming crossover design with intricate back holing and a ridged solid shank. Tested rose gold with platinum settings, circa 1900, accompanied by Gemological Certification Services report #78162-70.