Greek 18k Ruby Emerald Sapphire Diamond Ring Size 8.5. Thick 19mm ring set with marquis cut ruby 6.3x3mm, tear drop emeralds 3x4.3mm, square cut sapphires 2.6x2.6mm, and round brilliant cut diamonds 1.5mm. Marked 750 with Sigma symbol. Excellent condition. It weighs 10 grams.