What has the author Otto Kunz written?

Otto Kunz (October 12, 1874–March 19, 1952) was a Theosophist, gemologist, and author who wrote extensively on topics such as parapsychology, alternative medicine, and New Age spirituality. He is best known for his book "The Curious Lore of Precious Stones" (1913), which is considered a classic work in the field of gemology.

Additionally, Otto Kunz authored or contributed to several other books and articles, including:

- Gems and Jewels: Their History, Lore, and Superstitions (1904)

- The Magic of Jewels and Charms (1915)

- Shakespeare and Precious Stones (1916)

- The Power of Thought: Its Control and Culture (1919)

- Crystal Gazing: Past and Present (1924)

Otto Kunz was also an avid collector and donated much of his collection of precious stones and artifacts to the American Museum of Natural History in New York City.