Yellow Sapphire Diamond Ring, set with an oval pale yellow sapphire of ca. 4.90 ct (5 ct), not treated, surrounded by 14 old-cut diamonds totalling ca. 0.90 – 1 ct, G/H VS/SI, in 18K /750 yellow and white gold, ring size: 52, 4.9 g. Hallmarks: 18K GGTL Laboratories Sapphire Report No. 25-B-8279 Stock number: 2093 Yellow Sapphires get their colour primarily from the presence of Iron (Fe) in the crystal structure of the mineral Corundum (which is an Aluminium oxide, Al2O3) When iron is present in certain concentrations, it produces a beautiful yellow colour.
