This one might be the most famous colored-stone engagement ring, and it belongs ... features a 12-carat Sri Lankan sapphire, surrounded by 18 diamonds and set on an 18-carat gold band.

Her stunning engagement ring is a sight to behold, consisting of 14 solitaire diamonds surrounding a 12-carat oval blue Ceylon sapphire set in 18-karat white gold. Her gold wedding band ...

Kate has been alternating between her famous engagement ring and a different sapphire and diamond band. Royal watchers claim ...