Books are the training weights of the mind. Epictetus, ca. 50–135 CE
Brush, ink, paper and ink stone—known in China as the “four treasures”—are simple tools that gave humanity the power to communicate across time and space, even beyond death—granting our knowledge a form of immortality. Inspired by their enduring significance, we’ve named the Lotus Gemology reference database after them.
At Lotus Gemology, we believe knowledge belongs to all humankind. Towards that goal, we are opening access to our internal reference database—built over nearly four decades and thousands of hours of dedicated work—free of charge. This is both a tribute to those who came before us and a contribution to those who seek to carry gemology forward.
The Four Treasures database includes thousands of references in gemology, mineralogy, and related fields, with particular strengths in corundum, jade, emerald, spinel, color science, glyptic art, and Arabic-language sources.
10,436 references total
Hidden Treasures | Lotus Gemology's Special Literature GuidesFor those who wish to explore the literature of gems further, we recommend the following:
Key Reference BooksBelow are listed the key reference books for the literature on gems, minerals, jewelry and allied fields. To access a full list with cover images and abstracts, just do a general search on "bibliography" in our Four Treasures Reference Database.
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