if i have 2 non bound gems and 1 bound gem , can they be fused? and if fused, what it be bound or not? thanks in advance

If you use even single bound gem when you combine, nevermind how many unbound you will use, the result will be bound gem...
P.S. my advice - use only 5 gems to combine... =)

Agree! Please be aware that if you put only 3 gems in there, you'll show a very low lvl of success. Use 5 gems for 100% each time. You will lose your gems, fusion agent and money if you fail.

If you have even 1 bound gem, the result will be a bound gem. If you want to sell your gem, be sure not to use any bound.