OZ Pure Silver Proof Coin Canada. Original MINT CONDITION encapsulated w/ Certificate Authenticity & case/box, etc. The item "2017 Butterfly Bejeweled Bugs $20 1OZ Pure Silver Proof Coin Canada gemstones" is in sale since Saturday, June 24, 2017. This item is in the category "Coins & Paper Money\Coins\ Canada\Commemorative". The seller is "mario95coin" and is located in Ontario. This item can be shipped worldwide.