An inquisitive mind wanted to how Diamond Mountain obtained its name. It was so named in the 1850s, when prospectors found numerous crystal quartz along the range. The crystal clear quartz had a “diamond” like character. Some of these can be quite large. In the 1950s, a large crystal quartz weighing over 100 pounds as discovered on Thompson Peak and eventually found a home at the Smithsonian Institute. In 1910, Lassen County historian Asa Fairfield wanted to change Diamond Mountain to Mount Roop, but that did no go over well with anyone. Finally, the Honey Lake Pauite referred to the mountain range as wago yamos or ‘timber bend.”

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