Gemstone

Gemstones are 8 types of Crystal Hollows and Crimson Isle resources. They are used as crafting ingredients, forging, reforging 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.

Mining
Gemstones can be mined in from their ores except for Opal Gemstone which can only be found in the. Their ores generate in differently sized veins, in set locations within the Crystal Hollows and within random structures. Veins regenerate after five minutes, except when destroyed using.

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, except for Opal gemstones. A treasure chest can spawn in random structures or has a chance to appear when mining in the. The possible gemstone types depends on the location of its appearance.

Mines of Divan
Treasure Chests that are found using a in the  have a different loot table. The chance for a gemstone to appear in one of the chests is shown below.

Mobs
Certain mobs drop Gemstones when killed.

The Bal boss has a chance to drop a certain gemstone upon hit.

Crystal Nucleus
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
sells for.

Throwing the into the correct lava pool yields.

Collection
All 8 types of Gemstones from any source (except metal detecting in Divan Mines) increase the Gemstone Collection.

Usage
Gemstones are used in forging, , , , , , , , , , , ,.

Sell
All 8 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.

Gemstone Slots
Certain items have Gemstone Slots, where a corresponding gemstone can be applied. Some are already unlocked, and others require a and Gemstone to be unlocked. The Gemstone applied gives varying stat bonuses depending on its tier.

Trivia

 * Gemstones are the only Collection items which have 5 tiers (,, , and ).
 * The only way to instantly mine Gemstones is with any tool that can break them and Armadillo Pet's Tunneller Perk.