Gems are rare resources that can be obtained randomly from Mining. You will only start finding gems after finishing the Let The Mining Begin quest, however, the Miner does not have to be mining for you to find gems. This means that unlike Ores and Geodes, running more Machines or Miners will not increase your chance at finding gems.
|Gem||Rate (Ticks)||Rate (Days)||Avg Gems / 100 Days||Sell to NPC Shop|
Gems (except for Blood Diamonds) can be used to upgrade all Tools (except the Wrench), to provide increased rates (e.g., Trowel, Shovel, Axe, Chainsaw), decreased Stardust costs (e.g., Pickaxe and Hammer), or otherwise enhanced effects for that tool. Gems must be "socketed" in a tool in ascending order, from Sapphire to Emerald to Ruby to Diamond. Because they provide permanent buffs, it is generally advised to use all gems to upgrade your tools first, before using them for other purposes. It is generally advised to first upgrade your Brewing Kit, Axe, and Fishing Tool.
Treasure Chest Keys
Gems can be used to craft Treasure Chest Keys, which are used to obtain loot from Treasure Chests. Higher tier gems will provide more rolls on the loot table when opening the chest. Because of the relative rarity of obtaining Treasure Maps, it is generally advised to use at least an Emerald Key when opening chests, if not higher.
Gem Stardust Potions
The Sapphire Stardust Potion and Emerald Stardust Potion can be poured on a Sapphire or Emerald, respectively, consuming it and yielding Stardust. This can be a good alternative to selling unneeded Sapphires or Emeralds.
The Sapphire Glass Hand, Emerald Glass Hand, and Ruby Glass Hand, are all items that can be crafted (just once) to be sold to the Museum, and require one Sapphire, Emerald, or Ruby, respectively, also requiring Glass. The sell cost to the Museum is usually higher than the cost of the gem on the Market, so they can be easily submitted after obtaining the required Crafting level.
Gems can be sold either to the NPC Shop or the Player Marekt. Lower tier gems (Sapphires and Emeralds) generally only sell for slightly above the NPC Shop on the Player Market, but Rubies and Diamonds sell for significantly more on the Market.
|Sapphire • Emerald • Ruby • Diamond • Blood Diamond|