Bring something, no matter how small, back to the family that reminds them that you treasure them and are glad to be back from where ever it was you were.
By the way, the stone could be something quite valuable, if it contains gold or silver.
Correct as you have it. You have two independent clause joined by a semicolon and a conjunctive adverb (therefore). Those go in the order clause/semicolon/adverb/comma/clause, just as you have them.