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Diamond and Snowflake, M.J. Kobbert
Inclusions in Baltic amber, C. Gröhn
Amber – Searching and Collecting, C. Gröhn
Everything about Bernstein, C. Gröhn
Gemstone processing. Volume 1. Fischer K.
Gemstone processing. Volume 2. Fischer K.
The Amber Magician, Potsch O.
Stones - Minerals, gemstones and fossils
Hydropower and gemstones: 30 years of the German Gemstone Museum
Photoatlas of Inclusions in Gemstones 2, Gübelin & Koivula
Identification tables for gemstones, Günther
Gemstones and precious stones, Walter Schumann
