sorry evertime i want to get a jewel it comes a message that i have to many other staff than i sell it and it says again

GhettoBob, one of the admins, explained this on another thread:

If you own 2500 geos (or over), a total of 10,000,000 city value, or over 30,000 troops, you cannot jewelhunt anymore. Only Donators are an exception to this rule.