Vintage Art Deco Design .90 Carat Marquise Diamond + 6 Diamonds 18 Rubies Platinum Ring. The center .90 carat marquise diamond is I color and SI-1 clarity. There are 6 additional diamonds 3 on each shoulder of the ring those diamonds are I color and VS2 clarity. The rubies are gem color and clarity ring size is 7-1/4 weight 2.7 grams. This ring is in excellent condition. The inside of the ring shank is inscribed .90 for the diamond weight and 950 for the platinum purity.