Definition of black diamond

The term "black diamond" originally referred to a type of anthracite coal that was as hard and durable as a diamond due to its high carbon content. This high-grade coal was highly sought after for use as fuel because it burned cleanly and produced intense heat, making it a valuable commodity in the 19th century. However, around the mid-1800s, a new meaning for the term "black diamond" emerged in the context of skiing. This use of the term was likely inspired by the coal mining industry, as many ski slopes were situated near coal mines in the European Alps. Skiers began to use the term "black diamond" to describe the steepest and most difficult runs, which were as challenging as navigating a coal mine in the dark. The term has continued to be used in the skiing industry to describe the most advanced and hazardous runs, and reflects the bravery and skill required to navigate such extreme terrain. In this context, "black diamonds" are seen as a badge of honor for expert skiers, rather than a designation for a type of coal.