One option is to bring a laptop computer and find a WiFi connection to compare prices online with what you are offered.
Even then, verification of the goods is a concern.
As always, buyer beware.
I'd just go to look and leave my credit card at home.
Gem shows can result in some serious impulse buying.
I can''t comment on that show since I have never been.
I did go to the major industry show in Milan a number of years ago and it was absolutely amazing! If this show is even 10% of the one I went to, I wouldn''t miss it!