Which location is known for supplying sapphires that are most likely not heat-treated?

Yogi Gulch is recognized for producing sapphires that are typically not subjected to heat treatment, distinguishing it from other sapphire sources. While heat treatment is a common practice used to enhance the color and clarity of sapphires, Yogi Gulch is celebrated for its naturally occurring blue sapphires with rich colors, making them highly sought after by gem enthusiasts and collectors who value stones in their natural state.

In comparison, Tanzania, Thailand, and Madagascar are regions where sapphires are often heat-treated to improve their appearance. These areas supply a large portion of the global sapphire market and, as a result, many of the stones from these locales undergo enhancement processes. Thus, Yogi Gulch stands out for its production of untreated sapphires, making it a unique source in the world of colored gemstones.