Yes, there are rules when you buy gems.  And if you don’t know what they are, you can easily offend or, much to your disadvantage, drive up the price at which you buy.  These ten tips will save you some grief, and hopefully also some $$$ at your next gem buying spree.  Remember also that strict rules are established because it is easy to cheat in the gem business.  Trust, therefore, is everything.

In one word: overwhelming.  I was at the Jeweler’s Association Summer show at the Javitt’s Convention Center last weekend.  I had a long list of things I needed and a smaller customer wish list.  I had a good night’s sleep and got there 5 minutes after they opened.  Eight hours later, I was completely wiped out. 

The show I went to is mainly for jewelry but the AGTA pavilion has about 50 gem and...