GOLD (Minimum requirement: .995 fine)
•    American Eagle Bullion Coins
•    American Buffalo Bullion Coins
•    Australian Kangaroo Nugget
•    Australian Dragon Bullion Coins
•    Austrian Philharmonic Bullion Coins
•    Canadian Maple Leaf Bullion Coins
•    Canadian Mountie Bullion Coins
•    Chinese Panda Bullion Coins
•    Perth Mint Bullion Coins
•    Gold Bars
•    Gold Kilo Bars

SILVER (Minimum requirement: .999 fine)
•    American Eagle Bullion Coins
•    Australian Kookaburra Bullion Coins
•    Austrian Philharmonic Bullion Coins
•    Canadian Maple Leaf Bullion Coins
•    Mexican Libertad Bullion Coins
•    Silver Rounds (although legal to place, these are no longer recommended)
•    Silver Bars (Comex & Nymex approved)

PLATINUM (Minimum requirement: .9995 fine)
•    American Eagles Bullion Coins
•    Australian Koala Bullion Coins
•    Canadian Maple Leaf Bullion Coins
•    Isle of Man Bullion Coins
•    Platinum Bars

PALLADIUM (Minimum requirement: .9995 fine)
•    Canadian Maple Leaf Bullion Coins
•    Palladium Rounds
•    Palladium Bars