Color: Colored stones are bright, pure and uniform. For example, ruby ​​is best for pigeon blood red, and pink is the second. The more uniform the color, the more valuable and precious the gems are.
Clarity: Similar to the clarity grade of a diamond. Observing with a ten-fold magnifying glass, the more sputum, the more obvious the quality of the cockroach is, and the price is correspondingly lower. For example, calcium iron garnet, although it has an important basis for the identification of the "horsetail" inclusion body, it is still the top grade with high clarity and less inclusion.
Cut: Colored gemstones are available in a variety of cuts, including standard round, heart, peach, oval, olive and so on. The cutting of different gemstones depends on their own mechanical properties (such as cleavage, etc.), color, inclusions, special optical effects and other properties. If the shape of the cut is ribbed, it should be straight, flat and sharp. For example, emeralds are often honed into a standard emerald type because they have more cracks and are more brittle; tourmalines are also the most beautiful colors that can be transformed into emeralds. Another example is that the opal can only show its cat's eye effect by cutting it into a curved surface. Some other gemstones are also processed into curved surfaces due to the large number of inclusions.
Weight: There are fewer colored stones, especially those with better color and clarity grades. So of course the greater the weight, the more precious it is. Such as emerald, in the facet type of 0.2 ~ 0.3ct can be used as a high-end jewelry.
Special optical effects: colored gems with special optical effects, such as the bright line of the cat's eye effect, the straight, bright and bright lines are parallel to the long axis of the arc, and the stars with the star effect are to be given a little. Color-changing gems are better for color changes.
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