What is the primary color range of jet as a gemstone?

Jet, as a gemstone, is primarily known for its rich black color, often with deep brown undertones. This unique color characteristic is a result of its organic composition as a type of lignite, which is a precursor to coal. The density and highly polished surface of jet contribute to its luxurious appearance, making it a favored material in jewelry, particularly in mourning pieces during the Victorian era.

Although there are variations in color intensity and the presence of some brown hues, the overarching identity of jet as a gemstone is firmly anchored in the black to brown range. Understanding this helps in identifying and categorizing jet, distinguishing it from other gemstones that may display vibrant colors or transparency.