Crystalariums: Unlock Rare Gems in Stardew Valley

This guide explains how to obtain and utilize the Crystalarium in Stardew Valley, a valuable tool for gem and mineral replication. Note that this guide reflects the 1.6 update's changes to Crystalarium functionality.

Obtaining a Crystalarium

The Crystalarium recipe unlocks at Mining Level 9. Crafting requires:

• 99 Stone
• 5 Gold Bars (from Gold Ore smelted with Coal in a Furnace)
• 2 Iridium Bars (from Iridium Ore found in Skull Cavern or the Statue of Perfection, smelted in a Furnace)
• 1 Battery Pack (obtained by placing a Lightning Rod outside during a thunderstorm)

Alternatively, you can obtain a Crystalarium by:

• Completing the 25,000g Community Center bundle in the Vault.
• Donating 50 minerals (gemstones or geodes) to the Museum.

Using the Crystalarium

Place the Crystalarium anywhere – indoors or outdoors. Popular locations include the Quarry for mass production.

The Crystalarium replicates any mineral or gemstone (except Prismatic Shards). Quartz has the shortest growth time but low value. Diamonds offer the highest profit despite a 5-day growth time.

To move a Crystalarium, hit it with an axe or pickaxe. Any currently growing gem will drop. To change the gem being replicated, simply interact with the Crystalarium while holding the desired gem. The existing gem will be ejected, and the new one will begin growing.

Profit from your Crystalarium by replicating valuable gems. Diamonds are particularly lucrative and make excellent gifts for Pelican Town's residents.