Colored Gemstones

How can I judge the value and quality of a gemstone?
Simply put, the type of gemstone and color you select should be the one you like the most, the one that will give you the most pleasure to wear. However, colored gemstones are judged by their beauty and rarity. The same “four Cs” that establish quality in Diamond are used for colored gemstones: cut, carat weight, clarity and most importantly, color.