1.10 Marquise Diamond Solitaire Engagement Ring in 14K.  This lovely, modern 1.10 carat marquise diamond engagement ring in 14k white gold is a true classic! The GIA-certified, genuine natural diamond is eye clean and features a beautiful array of symmetrical facets for brilliance and shine. From the profile, a two-prong, 18k white gold band supports this mesmerizing diamond. The elongated shape of this stone will also make the ring finger appear more elongated and slender.