Every hobby develops its own literature.
For collectors of rocks and gems (I”ll get to jewelry enthusiasts in a different entry!) there are such magazines as:
Rock & Gem (rockhounds.com/ which has joined forces with Rock & Gem.
Gems & Gemstones (www.gia.edu/research-resources/gems-gemology/index.html is a print magazine for the professional gemologist, and is priced accordingly.
The Mineralogical Record (www.minrec.org/ is “the mineral collector’s knowledge base.)
Rock and Minerals (rocksandminerals.org/): “Amateurs as well as professional scientists delight in and pore over Rocks & Minerals, which has published feature articles on mineralogy, geology, and paleontology since 1926. Regular departments explore such topics as minerals for the collector; microminerals; recent books, videos, and DVDs; coming events; museum news; and personalities in the field. Detailed lists of collecting opportunities in specific localities are published periodically, as are special theme issues. Spectacular color photographs appear throughout each issue.”