The internet is an amazing thing. There are many wholesale gem sellers online and quite a few offer independent reports on the gems they sell. I particularly like the search function at Gem Select. They only offer AIGS reports on their gems, probably because they are located in Thailand along with AIGS. AIGS is not as well known as GIA but since Gem Select offers a no questions asked return policy, I would imagine the gems are accurately described. At least check out Gem Select's page on gemstones. It is very detailed and is even where I learned that blue topaz is rarely found naturally; most of the time, the blue topaz you see is irradiated white topaz. This informative page explains hardness of each gem so you can determine if it is suited to every day wear in your lifestyle.
Also, if you are looking to upgrade later, a jeweler could easily reset this stone with a diamond pave halo. So sparkly!