Gemstone Crystals

 are items that can be obtained by completing quests around 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.

The Jade Crystal is obtained in by finding 4 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  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 an exceedingly rare drop from mining Ruby.

The Jasper Crystal is a drop from killing  in the Fairy Grotto, or by looting chests in the Fairy Grotto.

Trivia

 * 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: "".
 * The Jasper Crystal used to drop as an item, and it could (and still can) be sold on the Auction House.