Facet Cut Gemstones
Known as lapidary work, the shaping, engraving, faceting and polishing of stones is performed by a person known as a lapidary. Before cutting, the lapidary selects the rough stone by inspecting the uncut crystals for clarity, size, flaws, and color. Viewing the crystals through a strong light source is the preferred method. It is important to choose the stones carefully, as mistakes in choice can lead to stones breaking during cutting, which wastes time and valuable gemstones. It is not easy to say how long it takes to shape and facet a stone from beginning to end.
I love GemSelect, personally. I browse their site almost daily to see all the new stones available. Their selection is pretty amazing. The quality isn't always the highest and the cut of the stones isn't always perfect. But for the price, and if you look hard enough, you can find a real gem, so to speak.