The physical characteristics of colored stones can be described as the light that passes through them, the unique visual effects they produce, and how they were cut. These are some terms which you can know by clicking here:

Transparent: Light moves through the stone quickly and with minimal distortion.

Translucent: The print will appear darkened or obscured if you try to read it through.

Opaque: Transmits no light. It is impossible to see through, even at a tin border.

Optic effects

Adularescence: Adularescence is a billowy, movable colored cloud effect found in some gemstones such as moonstones. It also has an internal, movable sheen.

Asterism: Asterism is the term used to describe the appearance of a star effect, which can be seen when a stone has been cut in a non faceted manner. Star ruby, sapphire, and garnet.

Chatoyancy: A cabochon-cut gemstone that produces a thin, bright line along the stone's surface. This effect is sometimes known as the cat's eye effect.

Iridescence: Iridescence is a rainbow-colored effect caused by a thin layer of liquid or air within the stone. The cracks that break the surface of gemstones are what cause most iridescence. Even though it may look beautiful, this can detract from the gemstone's value.

For example, in Roman times it was considered uncouth to wear a diamond faceted stone. Different cultures and religions have different preferences. The best gems in the world are both cut in one or the other. Do not base your quality judgments solely on the cut style.