Antique synthetic Ruby ring. 1 of 2 rings that I took to the jeweler today. This superb 18K ring has a synthetic Ruby. The jeweler told me that at the time this Deco ring was made, that the synthetic was more expensive that the real. This ring is a size 6 and weighs 2.3 Grams. The synthetic Ruby is approx. .25K. Excellent Deco ring. Hallmarked 18K.