The transparency of a crystal is related to the quality and quantity of light that passes through it. The transparency standard is that when light passes through crystal fragments or thin films with a thickness of more than 1 centimeter, the reflected image can be clearly seen. If the base image is not clear enough and only the outline is visible, then it will be semi transparent in the middle.
Crystal luster: Glass luster. This is true on both the polished surface and the cut.
Natural crystal stone
Natural crystal stone
Gloss refers to an optical property of a gemstone surface that reflects light. Crystals do not reflect beautiful starlight like sapphire and starlight like gemstones, nor do they emit a light blue wave like luster like moonstones, nor do they sparkle with colorful hues like the Opal stones.
To observe the luster of crystals, you can hold them in your hand and observe the surface reflection from the light or window projection. The brightness of transparent crystals is related to the strength of their luster.
