.75 Carat Diamond Solitaire RSVP Engagement Ring In 14kt White Gold. Size 9 - Our classic diamond solitaire engagement ring is sure to bring a smile to her face, and now you can let the diamond experts at Ross-Simons help you make the jewelry purchase of a lifetime just a bit easier. From our value-priced RSVP collection, this elegant diamond engagement ring is beautifully set with a .75 carat round brilliant-cut diamond. A classic 14kt white gold setting showcases the stone to perfection. With great diamonds at such great prices, the Ross-Simons Value Collection is the smart choice.