An code that can be bought directly in gemshop which will reward an item that:
1) gets converted to gems in major residence
2) is tradable in TO
Benefit: people that wish to "sell" gem rewards can do so - same way that unlimited items or gift-able items get traded already and people that want to buy gem items that arent giftable can get em without spending the money themselves (probably a lot would go towards premium time)
benefits for BB: Free gems can not be collected and "traded" by using these items and more money will go in the game - courtesy of the ones wanting to trade the gem item for other in game items in the marketplace