2.56 Three Stone Diamond Engagement Ring 14k Yellow Gold2. 56 Three Stone Diamond Engagement Ring 14k Yellow Gold. This modern, three stone engagement ring features 2. 56 carats of natural diamonds in 14k yellow gold. The GIA certified, Old Mine Cut center diamond has thicker facets that will allow this stone to glitter even in romantic candlelight. The center stone has a faint champagne hue that brings a subtle dimension to the near colorless accent stones. Two accent diamonds rest on either side of the