Gemstone Crystals

 are collectibles obtained from special tasks within the Crystal Hollows.

The Crystals aren't actual items, but rather achievements that can be tracked in the Heart of the Mountain menu. To get the rewards from the Crystal Nucleus the player needs to find and place five Crystals:, , , , and. The two other Crystals, and, are only used to forge the  and the. All the Crystals are obtained in a different way.

The can point to the locations of the Crystals or other important related locations.

The Jade Crystal is obtained in by finding 4 different Scavenged Items with a in the Mines of Divan. After giving the 4 items to their respective Keepers, the Crystal can be taken.

The Amber Crystal is obtained from the Goblin Queen's Den in the Goblin Holdout.

In order to obtain it, the player must first get the  Potion Effect, which is obtained from  after giving him 3 s of the same color.

After obtaining the King's Scent effect, the Queen's Den can be entered to obtain the Crystal. This effect lasts for 20 minutes, but it can be used multiple times to get the crystal. Entering water will remove the effect.

The Amethyst Crystal is obtained from entering the Jungle Temple by giving a a  (Obtained by killing the Jungle Key Guardian or purchased from Odawa) and completing the parkour.

The Sapphire Crystal is obtained by giving the 6 different (obtained from loot chests in the Precursor Remnants or from killing s) to  in the Lost Precursor City. After giving the parts to him, he will repair the Automaton Prime, and a door will open which reveals the crystal.

The Topaz Crystal is obtained after defeating Bal, located in Khazad-dûm in the Magma Fields.

After defeating the boss, the Crystal will spawn nearby.

The Ruby Crystal is obtained as a drop from mining Ruby or as a reward from the Crystal Nucleus treasure stash. It has a chance of to be rolled as a drop from the treasure stash.

The Jasper Crystal is a drop from killing  in the Fairy Grotto. It can also be obtained by looting chests in the Fairy Grotto, with a chance, or as a reward from the Crystal Nucleus treasure stash. It has a chance of to be rolled as a drop from the treasure stash.

Trivia

 * The place where the Topaz Crystal spawns in Khazad-dûm is surrounded by invisible barrier blocks, even if the Crystal has not spawned.
 * The Topaz Crystal can be collected before it appears by clicking on the barrier blocks where it would appear after defeating Bal.
 * If a player somehow tried to obtain a Crystal before they are supposed to (glitching in the Jungle Temple, entering the Goblin Queen's Den during lag, glitching into Automaton Prime in the Lost Precursor City, etc.), they will receive the following chat message: "".
 * All Crystals have an unobtainable item form, that can be seen in The Forge when forging Perfect Gemstones.
 * The Jasper Crystal used to drop as an item, and it could be sold on the Auction House. Jasper Crystals obtained before the change can still be traded and auctioned.
 * The Jasper and Ruby Crystals in their item forms can be donated to the Museum.
 * Without good luck, Jade Crystal and Sapphire Crystal seem to be the hardest to obtain.