Wow, what a gorgeous gem! We've not seen a gemstone cut like this before, with a thick square table set crosswise atop another square, creating a gorgeous diamond pattern. Just an exceptional stone. All Blue Topaz have been heated and irradiated to get their color. This is an industry accepted practice applied to all Blue Topaz. Natural stone. Most gems sold online aren't jewelry grade. They're either poorly cut, have weak color or too many inclusions, giving them the designation collector grade. Collector grade gems aren't worth nearly as much as jewelry grade. For Proxibid bidders, shipping is a flat rate of $6, no matter how many lots won. For Live Auctioneers bidders, shipping will be calculated automatically by Live Shipping and all winnings will be combined into a single package for one low rate.