Is this gemrock auction site you are commenting on please.
I have purchased on gemrockauctions before and have found some real nice bargains. In fact I just bid and won some nice London Blue Topaz tear drop cut pieces for a piece that a customer wants. My only problem with the site is when I go to pay. For some reason when I go to checkout and hit the PayPal option (the only one) it sends me to a blank screen! Ugh! It drives me NUTS!!!
I have found a FEW reputable dealers on eBay. Again look close and ask lots of questions.
All the best and happy hunting.