Parina
After Krishna returned Satrajit his gem, Satrajit apologized and offered it to him. Krishna declined, but told Satrajit that he would accept the gold that the gem produced. Satrajit also offered Krishna Satyabhama's hand in marriage, which Krishna accepted.
Now, Akrura, Kritavarma and Satadhandva were all suitors of Satyabhama, and Satrajit had allegedly previously promised Satyabhama's hand to any one of them. So they were seething w/ anger @ her being given away to Krishna. After Krishna left for Hastinapur, one night, Satadhandva went into Satrajit's home and stabbed him in his sleep, and stole the gem, which as agreed, was still w/ Satrajit, not Krishna.
Satyabhama on getting this news went to Hastinapur and told Krishna about this, so Krishna returned w/ her, and decided to pursue Satadhandva. Satadhandva appealed to Kritavarma to save him, but was turned down. He then appealed to Akrura, but w/ the same result, so he asked Akrura to keep the gem on his behalf. He then fled Dwarka, but Krishna chased him & killed him.
Not finding the gem on him, Krishna guessed that it was w/ Akrura. He confronted Akrura on that, and Akrura offered to return him the gem. Krishna however asked Akrura to keep the gem w/ him, but w/ a condition that it never be taken out of Dwarka.
P.S. One curiousity that I had was that since Krishna decided to keep it in Dwarka so that its fabled curse only affects Dwarka, why didn't he simply give it to his sons by Satyabhama, who would have been Satrajit's heirs?