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Similarly, you can sell them in 1000 gem -sacks yourself, and you can use them for creating booster packs for games you own here: http://steamcommunity.com/tradingcards/boostercreator/
Some people use them as trading currency
Otherwise, no real use. There was an auction market in 2014 December, but that's about it.
also there is some details in here: http://betterplaygame.blogspot.com/2017/12/what-is-steam-gems-how-to-get-steam-gem.html