.25 Antique Diamond Three Stone Engagement Ring 18kThis Art Deco three stone ring features a . 25 carat old European cut diamond center stone with two . 02 carat diamonds on either side, set in 18K white gold. The center diamond grades SI1 in clarity, meaning tiny inclusions are barely visible under magnification and invisible to the naked eye, and I in color, showing slight warmth that's typical for vintage stones and hardly noticeable when set. Old European cuts were hand cut in the early 1900s and