The Royal Canadian Mint released today an official wedding coin to mark the Royal wedding of Prince William and Kate Middleton which takes place in 23 days. The pure silver $20 coin captures the image of William and Kate on their engagement day and has a blue Swarovski crystal to represent the 18-carat sapphire that belonged to Prince Willia***ate mother Princess Diana. The coin was designed by Canadian artist Laurie McGaw. Click here to pre-order shipping starts May 1st 2011.