HRH Diana, Princess of Wales engagement ring.   The engagement ring consists of 14 solitaire diamonds surrounding a 12-carat oval blue Ceylon sapphire set in 18-karat white gold. It was created by jeweler Garrard and cost at the time, 28,000 pounds sterling. This ring was neither custom-made nor unique and was, at the time of her engagement to Charles, featured in Garrard's jewelry collection to be readily accessible to the public. Kate Middleton Ring, Kate Middleton Engagement Ring, Diana Engagement Ring, Royal Engagement Rings, Princess Diana Ring, Looks Kate Middleton, Diana Ring, Kate Middleton Photos, Celebrity Engagement Rings