What is the Difference Between Crystal and Diamond?

Diamonds and crystals are both beautiful and used in jewelry, but they have several differences that set them apart. Here are the main differences between crystal and diamond:

1. Hardness: Diamonds are known for their exceptional hardness, scoring a 10 on the Mohs scale, while most crystals have a hardness rating of around 7-8.
2. Geometry: Diamonds display a harmonious symmetry, whereas crystals reveal an array of different crystal systems.
3. Density: Diamonds are denser than most crystals, which can be seen in their specific gravity.
4. Optical Properties: Diamonds have a high refractive index, causing light to bend dramatically and produce their characteristic sparkle. In contrast, most crystals have a lower refractive index and exhibit double refraction, while diamonds undergo single refraction.
5. Heat Conductivity: Diamonds are known for their excellent heat conductivity and electrical resistance, which can also provide insight into identifying them from crystals.
6. Cut: A diamond will usually have more facets than a clear crystal due to its elongated shape, allowing for multiple angles in the cut.
7. Primary Color: A diamond should have a clear, bright yellow or white color, while crystals can have a variety of colors.
8. Surface Streaks: Diamonds are usually cleaner than crystals, although some may have speckles due to their cut.
9. Value: Diamonds are more valuable than crystals due to their high quality, durability, and brilliance.

Comparative Table: Crystal vs Diamond

Here is a table comparing the differences between crystal and diamond:

Crystals are composed of silica and have a Mohs hardness of 7, while diamonds are composed of carbon and have a Mohs hardness of 10. Diamonds are formed in carbon-rich environments, whereas crystals form in igneous, metamorphic, and sedimentary rocks. Crystals are used for decoration and pencil leads, while diamonds are used in jewelry and industrial cutting and grinding applications due to their hardness.