About Steam Gems: https://steamcommunity.com/market/listings/753/753-Sack%20of%20Gems
Steam Gems are not currency in Minion Masters, but are an item that can be traded on the Steam community market for a small amount of store credit if your account is at least level 5. Steam may impose a 7 day waiting period before you are able to accept the trade offer. If your account is unable to accept the trade within a month, the Gem portion of the prize might be forfeit.
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