diamond merchant
1. Someone that sells diamonds.

2. Derogatory term for a Jewish person. Made famous by the so-called Reverend and bigot Al Sharpton during the Crown Heights Riot of 1991.
1. That diamond merchant ripped me off good.

2. Al: "Sorry, but we don't have room for the diamond merchant."
Jesse: "Yes we do, just stick him in the ashtray!"