This guide explains how to obtain and utilize the Crystalarium in Stardew Valley, a valuable tool for efficiently producing gemstones and minerals. Note that this guide reflects the mechanics as of the 1.6 update.

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 (Requires Iridium Ore, smelted in a Furnace; found in Skull Cavern or from the Statue of Perfection)
• 1 Battery Pack (obtained by placing a Lightning Rod outside during a thunderstorm)

Alternatively, you can obtain a Crystalarium by:

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

Using the Crystalarium

Place the Crystalarium anywhere (indoors or outdoors). The Quarry is a popular location for multiple Crystalariums.

The Crystalarium replicates any gemstone or mineral (except Prismatic Shards). Growth times vary: Quartz is fastest, Diamonds are slowest (5 days) but most profitable.

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 gemstone or mineral. The current gem will be ejected, and the new one will begin growing.

By strategically using Crystalariums, players can significantly increase their gemstone yield, boosting profits and improving relationships with villagers who appreciate gemstone gifts.