White Gold Rhodium Bonded with a Black Onyx Centerstone and Pave CZ on the Prongs in Silvertone. Black Onyx Egg is an amazing cocktail ring. Made to make on lookers gawk in amazement. This piece features on large black onyx stone handset by pave CZ prongs in silver tone. White Gold Rhodium Bond is achieved using an electroplating process that coats the item with heavy layers of rhodium a close cousin of platinum that costs three times as much which gives our jewelry a platinum luster.