People magazine reported that the ring features a 3-carat, cushion-cut center stone sourced from ... Middleton Kate Middleton's unique 12-carat sapphire — surrounded by diamonds, no less ...

Based off the photos, UK jeweler Steven Stone wrote that the ring featured a “six carat cushion-cut diamond,” estimating it to be $300,000 and adding, “I wouldn't be surprised if it was ...