There is a +-64m variance on their spawning range.
All gems can be used to create Focusing Lens of varying quality, which increase the energy transmission speed of the Laser Energy Transmitter as well Location Markers. In addition, some gems have other uses, as explained in the detail pages.
|Diamond Crystal||Found in semi-open caves on the surface down to about halfway to the cold cavern. Click on Diamond Crystal for more details.|
|Emerald Crystal||Found in the caverns below diamonds down to the cold cavern.
Click on Emerald Crystal for more details.
|Ruby Crystal||Found in the caverns immediately below the cold cavern, down to about halfway to the toxic cavern.
Click on Ruby Crystal for more details.
|Sapphire Crystal||Found below rubies down to near the top of the toxic cavern.
Click on Sapphire Crystal for more details.
|Topaz Crystal||Found almost exclusively in the toxic cavern.
Click on Topaz Crystal for more details.
|Sugalite Crystal||Found below Topaz, and at least as deep as the magma cavern and likely much deeper.
Click on Sugalite Crystal for more details.