Color Change Sapphire Ring 18kt Yellow Gold. ¬†The center six-prong setting contains one round cut color-change sapphire¬†(0.23ct). ¬†Under fluorescent light it is dark, slightly grayish, blue in color and under incandescent light it is medium-dark, moderately strong, strongly purplish-Red in color. The ring was cast, hand-stamped and handset,¬†¬†it is in very good condition. Ring size: 9¬† 3/4, ¬†it includes an insurance appraisal of $800.00.