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In the game of Blackjack, the term "double diamond" usually means trouble and lower pay on blackjack payouts.  This means that the end result will be favorable to the house and unfavorable to the player.

Normal blackjack pay is 3 to 2 pay.  With this pay if the player bets $10 and gets a blackjack (and the dealer does not) then the the player will get their original $10 back and receive $15 more from the dealer.  With double diamond blackjack, most of the blackjack pay is "even up".  This means that on a player blackjack (and of course the dealer does not also have a blackjack) that the player would get their original $10 bet back, but only receive $10 more instead of the normal $15 winnings.  Now in the case that the blackjack is both diamonds - diamond for the ace and for the ten valued card - then the player would receive $20.  While $20 may sound great, a double diamond blackjack just does not happen often.  It is approximately (but not exactly) one chance in 16 - which means that overall the player will receive lower overall winnings from blackjacks - and hence for the overall game.

Double diamond blackjack play is sometimes used as part of other blackjack variations such as super fun 21.  While double diamond pay lowers winnings for the player, the casinos compensate at least at little of this amount back by allowing additional rules of allowing surrender more often, or double down after the first two cards.


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