A diamond is one of the best-known and most sought-after gemstones. Diamond crystal: A gem-quality diamond crystal in the rock in which it was formed. It is an octahedral crystal with strong growth lines on its surface and an estimated weight of about 1.5 carats.
Historical and contemporary terms describing diamond beauty. The historical words, brilliance and fire, and the more recent word, scintillation, are three terms that have evolved to describe diamond beauty