Key Takeaways

In Stardew Valley , a can be used to duplicate certain gems and can be crafted using 99 , 5 , 2 , and 1 . The recipe for Crystalariums is acquired at Mining Level 9 , but players can receive a Crystalarium as a reward before then for completing the 25,000g Bundle in the Community Center, or for donating 50 items to the Valley Museum.

These machines are highly effective for producing a variety of profitable, valuable, and giftable gemstones. This list ranks the best gems for Crystalariums based on their usefulness, selling price, and production time, allowing players to make informed decisions on gem reproduction.

It is highly recommended that players choose the Gemologist Profession when aiming to profit from gems, as it boosts their selling price by 30%.

Those looking to profit as much as possible in Stardew Valley should consider pursuing certain marriage candidates over others.

10 Neptunite

Good Price And Can Be Used As Dye

is a mineral found in and that can be donated to the Valley's museum . It can also drop from slain Black Slimes in the Slime Hutch at a 5% chance, along with (another donatable mineral).

With a high selling price and a strong gold per day value, Neptunite is a decent choice to place inside Crystalariums. The mineral can also be used for black dye in a , making it fairly versatile compared to other donatable minerals.

9 Helvite

Profitable And Creates A Unique Clothing Item

Found in and , is a liked gift for the and can be used as red dye in a . It can also be crafted into the Classy Top, a clothing item that varies depending on a player's gender selection.

Helvite has a high selling price and is a better option than based on the gold per day value.

8 Star Shards

A High Selling Price

have the second-highest selling price of all the gems that can be placed inside a Crystalarium. However, it ranks lower due to its limited usefulness beyond generating profit.

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Its only other notable uses are as a liked gift for the and its use in the , where it creates the unique Star Shirt. Additionally, it can be used as red dye in the sewing machine. Four Star Shards (along with one ) are needed to make a Star Shirt and dye it completely red.

7 Amethyst

A Liked Gift For Almost All Villagers

has a significantly lower selling price than the previous entries on this list, but its usefulness and quick production make it generally a better option for players. This gemstone is a loved gift for , , , and the and is liked by all the villagers except , , and .

When improving a melee weapon in the Volcano Forge , an Amethyst can be used to increase the weapon's knockback, meaning monsters will recoil further away once hit. Moreover, an Amethyst can appear as part of the Help Wanted requests on the board outside Pierre's.

6 Aquamarine

Useful In The Forge

Loved by , , and the , can be used in a variety of ways. With a slightly better selling price than , Aquamarine is a good option for Crystalariums in the early game, as they are not too hard to find and can generate a great profit .

At the Forge in the Volcano, an Aquamarine can be used to increase the critical hit chance on a melee weapon, making it more likely that the weapon will deal additional damage to enemies. It is also necessary in the crafting recipe.

5 Fire Quartz

Great For Bulk Gifting

has a decent gold per day value, as one can be crafted within one in-game day. It is also a liked gift by all the villagers except , , and , making it an excellent choice to have in bulk for gifting throughout the valley.

When climbing Pelican Town's social ladder, these Stardew Valley villagers serve as great places to start because of how easy they are to befriend.

It can be smelted in a with one to make 3 , an essential item for crafting . When aiming for perfection, Fire Quartz is an essential item as it must be given to the museum. It is also used for crafting both the and the .

4 Emerald

Use In The Forge Or Sell For A Good Price

An can be used in the Volcano Forge to increase the speed of a melee weapon, which means attacks and recovery times will be faster. Each point of weapon speed reduces hit time by 40 milliseconds, meaning three Emeralds would reduce the hit time by 120 milliseconds.

Emerald is a liked gift by all except , , and , and is loved by , , , and the . Its high selling price and good gold per day value make it a solid choice to reproduce in Crystalariums.

3 Ruby

Trade For Spicy Eel At The Desert Trader

both has an excellent selling price and is highly useful. It can be traded at the Desert Trader for a . This food item provides +1 luck and +1 speed, which is highly valuable when mining in the Skull Cavern.

Players will need to be prepared before venturing into the Skull Cavern in Stardew Valley. Luckily, the following food items should help.

Furthermore, when used in the Volcano Forge, it can increase attack on a melee weapon. It is a liked or loved gift for all villagers except , , and but can be requested by anyone as part of a Help Wanted quest.

2 Jade

Good For A Journey Into The Skull Cavern

With a relatively short crafting time, a multitude of uses, and a high selling price, is a great option to place in Crystalariums. It is a great giftable item, loved or liked by nearly all villagers, and can also be used as green dye in the .

Its most valuable use, however, is trading at the Desert Trader on Sundays for , which can help with reaching floor 100 in the Skull Cavern. Where they would usually require 99 to craft, the Desert Trader accepts one Jade per Staircase, which is a worthy investment.

1 Diamond

The Highest Selling Price And Most Useful Gem

Paired with its incredibly high selling price, has the most uses of all gems available for reproduction through Crystalariums. It is required for several useful crafting recipes, such as the , , and . Additionally, it can be requested on the Help Wanted board, offering players a reward of 2,250g and 150 friendship points with the requester. Diamond is a loved gift by , , , , , , , and , making it an excellent choice for gifting.

As of Stardew Valley 's 1.6 update, 10 Diamonds can be exchanged for Book at the Volcano. After reading this book, all stones broken with a pickaxe have a 0.66% chance of dropping a Diamond. This item becomes much more accessible if players are already reproducing Diamonds in a Crystalarium, as it takes just 50 days (less than half an in-game year) for a single Crystalarium to produce 10 Diamonds, giving players plenty of time to work towards unlocking Ginger Island .