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Small amounts of defects or impurities (about one per million of lattice atoms) color diamond blue (boron), yellow (nitrogen), brown (lattice defects), green, purple, pink, orange or red.Diamond also has relatively high optical dispersion, that is ability to disperse light of different colors, which results in its characteristic luster.In the 20th century, experts in gemology have developed methods of grading diamonds and other gemstones based on the characteristics most important to their value as a gem.Four characteristics, known informally as the ) that crystallizes into the diamond lattice which is a variation of the face centered cubic structure.

Unlike many other gems, it is well-suited to daily wear because of its resistance to scratching—perhaps contributing to its popularity as the preferred gem in engagement or wedding rings, which are often worn every day.Diamonds have been adapted for many uses because of the material’s exceptional physical characteristics.Most notable are its extreme hardness and thermal conductivity (900–2,320 W·m Despite the hardness of diamonds, the chemical bonds that hold the carbon atoms in diamonds together are weaker than those that hold together the other form of pure carbon, graphite.Diamond is renowned as a material with superlative physical qualities, most of which originate from the strong covalent bonding between its atoms.In particular, diamond has the highest hardness and thermal conductivity of any bulk material.

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