This guide explains how to obtain and utilize the Crystalarium in Stardew Valley, a valuable tool for gemstone farming. The 1.6 update introduced subtle changes to its functionality, which are included here.

Obtaining a Crystalarium

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

• 99 Stone
• 5 Gold Bars (5 Gold Ore + 1 Coal per bar, smelted in a Furnace)
• 2 Iridium Bars (Smelted Iridium Ore from Skull Cavern or the Statue of Perfection)
• 1 Battery Pack (obtained from a Lightning Rod struck by lightning)

Alternatively, obtain a Crystalarium by:

• Completing the 25,000g Community Center bundle.
• Donating 50 minerals to the Museum.

Using the Crystalarium

Place the Crystalarium anywhere (indoors/outdoors). The Quarry is a popular location for mass production.

The Crystalarium replicates any gemstone or mineral (except Prismatic Shards). Quartz has the shortest growth time but low value. Diamonds have the longest (5 days) but highest profit margin.

To move a Crystalarium, hit it with an axe or pickaxe. Any gem being replicated will drop. To change the gem type, simply interact with the Crystalarium while holding the desired gem; the old gem will be ejected.

Profit from the Crystalarium by producing valuable gems for sale or gifting to increase relationships with villagers.