From LSWiki

Mundane Stones/Gems

• Ordinary Valuable Rocks
  • pearls, peridots, garnets, rubies, sapphires etc...
  • Blah Blah Gemwake, makes Ioun Stones
  • Blah blah blah that one guy that likes these

Magic Rocks

• For each of points do explain where to find, what they commonly get used for.
  • (blah blah Power_Potion_Quest, Arjay_Deo, Zetesai, Aligned)
  • fulgurum crystals
  • coruscars
  • warpstones
  • Manifold, Integer, Unity stones
• other types of mundane gems?

Enchanted Stones

(where to find, what they're for)

Ioun Stones

These. Also this and this

Preservation/Perpetuation

protect followers from b die.

Protection

keep in your inventory, absorbs some damage of a particular type. Breaks eventually also this thing

Retrieval

attune to a follower, then use it to summon them? I dunno.

Shrinking

tap to make you smaller for a bit, not entirely sure how these work.

Revealing

no idea what or how these work. Tapping them might make invisible stuff visible?

Sphere Quest Gems

Dat Thrassos wants dem rawks.

Silmarilios

elflord thing

Other Magical rocks of interest