Gemstone

Gemstones are 7/8 types of Crystal Hollows and Blazing Fortress resources. They are used as crafting ingredients and can be added to certain items to boost certain stats.

Mechanics
Gemstones come in 8 varieties:, , , , , , , and.

Each Gemstone has 5 tiers, listed from lowest to highest:, , , and. Each tier is crafted from 80 of the previous, except which is created in The Forge.

Mining
Gemstones can be mined in Crystal Hollows from their ores. Their ores generate in differently sized veins, in set locations within the Crystal Hollows and within random structures. Veins regenerate after some time, except when destroyed using Bob-omb.

Mining Gemstones will always give tier of the item. grants a chance to drop a gemstone for each  gemstone harvested.

Treasure Chests
Gemstones of Rough, Flawed and Fine qualities can be found in treasure chests. Treasure chests spawn in random structures or randomly when mining in the Crystal Hollows.

Treasure chests will only contain the Gemstones found within the area. For example, Magma Fields chests will only contain and. Multiple (typically 2-8) stacks of loot generate in 1 chest.

Mobs
Certain Crystal Hollows mobs drop Gemstones when killed. The Bal boss has a chance to drop or  when hurt.

Crystal Nucleus
The Crystal Nucleus loot bundle drops 1 Fine Gemstone of each type when completed. It can also drop additional Flawed, Fine and Flawless Gemstones of any kind.

Other
Odawa sells for.

Using the Metal Detector in the Mines of Divan can yield random amounts of Rough, Flawed, and Fine Gemstones of any kind.

Throwing the Eternal Flame Ring into the correct lava pool yields.

Collection
All 7 types of Gemstones from any source (except metal detecting in Divan Mines) increase the Gemstone Collection.

Forging
Gemstones are used in many different recipes in The Forge.

Sell
All 7 types of Gemstones sell for the same price to NPCs. Rough, Flawed, and Fine Gemstones can be sold. The ability to sell Flawless and Perfect Gemstones is disabled.

Equipment gemstone slots
Gemstones can be applied to select items at Geo. They provide different stats to the item based on the Gemstone's quality and type, and the item's rarity.

Items which can accept Gemstones will show the number and type of slots in their tooltips. Unlocked slots are shown in grey, while locked slots are shown in dark grey. The colour of the symbol within the square brackets denotes the type of Gemstone in the slot, while the colour of the square brackets denotes its tier. The stats granted by Gemstones are reflected in the item's stats list, with the additional stats from the Gemstone shown in pink.

When applied to a Talisman of Power, Ring of Power or Artifact of Power, the granted stats are halved.

Special slot types
Gemstone slots that match the icon of one of the above stats belongs to that stat. The rest are:

Trivia

 * Gemstones are the only Collection items which have 5 tiers (,, , and ).
 * Gemstones are the largest section in the Bazaar, with 35 products.