no you cant
why'd you buy/open a chest if you knew you didnt have a use for it?
I mean you can give it to me
no I'm pretty sure you can't(but I can see why Roblox got really cringe and boring lately)
in 3 steps
Choose the game that interests you and play itfor free.
Every game has some quests for which you will receive Soul Gems.
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
You know that on Gamehag you can get real rewards for free, right? Join us, complete walkthrough and get your chest!
I got Robux in a chest here and I don't play Roblox so I have no use for it, but there was no option to sell it for gems.