Buy the Bling by Wilkening Jewelry 18 Kt. Gold Plated Royal Engagement Ring at eBags.com! Voted 2006 Website of the Year, eBags offers the best prices on a huge selection of bags, luggage, backpacks, handbags, and more. This is an exact replica of the stunning Kate Middleton engagement ring previously worn by Princess Diana of Wales. It is plated with 18 kt. gold and is crafted of a stunning sapphire Swarovski crystal.. Typically sapphires are so deeply hued that light is unable to pass through. However our ring is crafted of a stone that is light enough to enable light to pass through giving it that royal edge!. Ring is 3 4 long and 1 2 inch wide. The original is an 18 carat sapphire surrounded by diamonds which was made by Garrard the Crown Jewellers and is appraised at approximately half a million dollars..