Emerald Gemstones online direct to you at wholesale prices. Gem Rock Auctions has the largest selection of Emeralds online. Browse our selection of faceted stones from Colombia, Zambia and many more locations. When selecting a faceted stone, the first thing to asses is the overall color of the stone. The greener the stone without hints of blue, the more desirable it is. Next look for inclusions or imperfections. It is common for this type of gemstone to have imperfections so do not put too much weight behind it when making the decision.