1.50 Carat Solitaire Engagement Ring. Brilliant Round Diamond Engagement Ring. Stunning solitaire side stone diamond ring set in 18k white gold. It has a total carat weight of 1.50 carats which is made up with a 0.75 carat center diamond plus 0.75 carats on the band. The center round brilliant cut diamond is GIA certified and set in a four claw setting. The diamond itself is independently certified and is G in colour and has VS2 clarity. This ring is also available in all precious metals.