Art Deco Style Black Onyx and Diamond Ring A dramatic Art Deco style ring, superbly crafted in platinum and centered with a beautiful, vintage .85 carat European-cut diamond and featuring contrasting black onyx and a halo of bright-white diamonds – a classic Art Deco combo.Art Deco engagement ring, circa 1925. Featuring a .79 carat (approx) EGL certified old European cut diamond with F-G color and VS1 clarity. The center stone is accentuated by a row of triangle cut emerald arrows on ether side, and single cut diamonds all around the geometric platinum setting. Via Diamonds in the Library. 75697e945d30df347433b9cd09e17871–tiffany-rings-tiffany-and-co.jpg (736×736) Wearable art for everyday life, designed and handcrafted by Yoshinobu Kataoka. Jenny Jewelry Diamonds/Sapphires/Art Deco. Who could ask for more?