Black Diamond is a promo card for DIG: the Card Game that can be added to the deck for more game play variety. Simply shuffle the card into the starting deck and play. The pertinent rules are included on the card itself. Card Text: Always sells for 6 Gold Coins; do not shuffle back into the Mine Deck. Note: The Black Diamond is a once-per-game find, adding additional excitement and fun every time your Dwarves go digging.