Gems

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Various colors of gem
The UI icon for gems
Gems are valuable resources used by Architects to draft Special Floorplans.
― Glossary of Terms

Gems are a resource in Blue Prince. They are most frequently used to pay for Special Floorplans, though other effects such as the Study may allow gems to be spent in other ways. They are almost universally referred to in-game using the icon and are the associated resource of Green Rooms.

As a resource item, gems come in six color varieties - blue, yellow, pink, cyan, green and red - though the differences are purely cosmetic and are lost once the gems are collected. Gems do not show a name card or description when picked up, nor are they added to the inventory. Instead, they float up to the top of the screen where they are added to the gem count without interrupting play. This count is only visible once one or more gems have been obtained today, though it will still appear if the number of gems drops back down to 0 within the same day. The number of held gems is reset to 0 at the start of each new day.

How to obtain

Does it never end?

This list is incomplete. You can help by expanding it.

Gems have a chance to appear as items randomly in a large number of rooms, and frequently appear in trunks.

Rooms, locations and effects that guarantee physical gems

  • Upgrade Disk [Upgrade Spoiler: Spare Room] The Spare Patio spreads 1 to each Green Room when drafted.
  • The Parlor contains 2 within one of the boxes as a prize for solving the Parlor Game.
    • Upgrade Disk [Upgrade Spoiler: Parlor] One upgrade increases the prize to 3, while another makes it a per Red Room.
  • [Post-Credits Room: Gallery] The Gallery gives 2 gems as a prize for solving two of the puzzles.
  • One item in the Walk-In Closet is always a .
  • The Storeroom always contains 1.
    • Upgrade Disk [Upgrade Spoiler: Storeroom] One upgrade increases the gem count to 2.
  • The Den always contains 1.
  • The Wine Cellar always contains 3.
  • [Post-Credits Room: Trophy Room] The Trophy Room always contains 8.
  • [Puzzle Spoiler: Office Safe] The safe in the Office always contains 1.
  • [Puzzle Spoiler: Drawing Room Safe] The safe in the Drawing Room always contains 1.
  • [Puzzle Spoiler: Study Safe] The safe in the Study always contains 1.
  • [Freezer Spoiler] The Freezer always contains a frozen pink gem and a frozen yellow gem, which can be collected after being thawed by the Furnace or an ignition tool.
  • [Puzzle Spoiler: Boudoir Safe] The safe in the Boudoir always contains 1.
  • Upgrade Disk [Upgrade Spoiler: Boudoir] One Boudoir upgrade makes it always contain 1.
  • The Patio spreads 1 to each Green Room when drafted.
  • Upgrade Disk [Upgrade Spoiler: Courtyard] One Courtyard upgrade makes it always contain 2.
  • Drafting the Patio will spread gems throughout the Green Rooms in the house.
  • [Secret Room: Morning Room] The Morning Room always contains 2.
  • [Puzzle Spoiler: Shelter Safe] The safe in the Shelter always contains 1.
  • [Document: Her Ladyship's Sleep Diary] If you call it a day in the Bunk Room, a gem flower spawns in the Tomb.
  • [Puzzle Spoiler: Underpass Gate] The safe in The Underpass always contains 1.

Gem flowers

A gem flower in the Patio

Some effects cause gem flowers to sprout in certain Green Rooms. These specially bred-flowers house pink gems in their centers which can be collected the same as any other gem.

  • Activating Florealis, Bloom of the Sky causes newly drafted Green Rooms to contain special flowers which provide 1 each.
    • The Courtyard and Cloister each contain two gem flowers due to this effect, whereas all other Green Rooms contain one.
  • Upgrade Disk [Upgrade Spoiler: Nursery] The Indoor Nursery gains two gem flowers whenever a Green Room is drafted.
  • [Pump Room: Greenhouse] The Greenhouse, when supplied with enough water, contains between one and three gem flowers.

Effects that provide gems directly

Room effects

Item effects

  • The Treasure Map can be used to find treasure which may consist of 8, 3 and 25, or 40.
  • The Watering Can can be used once per Green Room to provide 1, up to three times per day.
    • [Pump Room: Kitchen] The water can also be refilled in the Kitchen for additional uses.
    • [Puzzle Spoiler: Family Core] The water can also be refilled in the Trading Post.
  • [Secret Item: Crown of the Blueprints] The Crown of the Blueprints gives 1 per use.

Other effects

Shops that offer gems

  • The Commissary may sell five gems at 3 each, and may sell a single set of 4 for 10. Gems are more frequently offered if some of its special items are unavailable, and the individual gems and the set are both guaranteed if none of its special items are available.
  • The Laundry Room can swap the quantity of all held gems with either coins or keys for a price of 5.
    • [Steam Power: Laundry Room] With the Specialty Services, quantities of held gems and steps may also be swapped for 5.
  • The Trading Post may offer the trade of a held special item for gems.

Usage

The Courtyard with its requirement of one gem

The primary use of gems is as a currency used to purchase certain floorplans. Every floorplan has an associated gem cost of zero or more gems; floorplans with a nonzero gem cost are called special floorplans, whereas floorplans with no gem cost are considered to be "free" floorplans.

When drawing floorplans while drafting, the floorplans in the second and/or third slots may be special floorplans. Gem costs are shown below special floorplans using an equivalent number of symbols. It is usually impossible for first slot to be a special floorplan; in the rare event that it is, such as due to drafting from a restricted draft pool via the Secret Passage, then the cost of that floorplan is bypassed.

Attempting to draft a special floorplan with fewer gems than are required will block the action and cause both the gem requirement and gem count to flash red. Otherwise, the special floorplan is drafted and a number of gems are deducted equal to the gem cost.

Certain effects provide other uses for gems:

  • The Study adds a drafting action that redraws floorplans at a cost of 1 per use. This action can be used no more than 8 times per draft.
  • West Path [Outer Room: Shrine] The Blessing of the Dancer adds a drafting action that rotates floorplans at a cost of 1 per use. There is no limit to when and how often this action can be used other than its gem cost.

Sometimes, the number of gems held is important even without them being spent:

  • When using a Stopwatch, rooms do not cost gems to draft, but having the gems is still required to draft them.
  • [Puzzle Spoiler: Aries Court Puzzle] The puzzle in The Precipice/Unknown requires having 0 as one of its requirements.
  • [Game Mode Spoiler: Dare Mode] One dare requires ending the day with at least 1 gem. Another dare requires ending the day with 0 coins, gems, and keys.
  • [Datamined Information] When more gems are held, the odds of drawing special floorplans is higher than with fewer gems.

Gems can be lost in a way that isn't considered spending them (and thus can be done even at 0):

Interactions

Gem cost interactions

  • The Terrace reduces the gem cost of all Green Rooms to zero.
    • Upgrade Disk [Upgrade Spoiler: Spare Room] The Spare Terrace upgrade mimicks the effect of the Terrace.
  • The Emerald Bracelet completely eliminates all gem costs from drafting while held, removing the need for gems or allowing them to be used for other purposes.
  • West Path [Outer Room: Hovel] The Hovel modifies all gem costs, replacing with them with step costs at a 3 to 1 rate.
  • [Secret Shop Item: The Axe] The Axe can be used to permanently remove any floorplan's gem cost, if it has one.

Other gem interactions

  • The Freezer prevents any gems from being collected, spent, or lost. Any effects that have a gem cost cannot be used while gems are frozen.
  • For sixty seconds after collecting a Stopwatch, gems are not deducted when drafting a special floorplan. Drafting a floorplan while holding fewer gems than required is still not allowed.
  • There is a particular experimental trigger which is activated by spending at least two gems to draft a room.
  • [Major Constellation: Spiral of Stars] After 78 words have been added to the Spiral of Stars, it prevents gaining any more gems for the rest of the day.
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