Gemmae
Crystals across seven categories and six rarities that boost mining, enchants, progression, and more.
Gemmae (singular gemma) are crystals that grant powerful bonuses while equipped or activated. Across seven categories and six rarities, gemmae can boost your mining income, supercharge your enchants, accelerate your rank and prestige, expand your backpack, and much more. Some are permanent equips; others are one-shot consumables that fire a game-changing effect.
Categories
Every gemma belongs to exactly one category. The category tells you what aspect of your citizen it boosts — pick the category that matches your current goal.
| Category | What it boosts |
|---|---|
| Economy | Boosts money, tokens, and currency gains — the Croesus path. |
| Mining | Enhances mining speed, radius, and block rewards. |
| Enchant | Amplifies enchantment proc rates and effects. |
| Progression | Accelerates rank and prestige progression, cuts costs. |
| Beacon (Civitas) | Increases Civitas beacon generation rates. |
| Utility | Provides utility boosts — storage, teleportation, sell bonuses. |
| Event | Amplifies event participation and reward multipliers. |
Rarities
Each gemma has a rarity from Common to Mythic. The rarity sets the gemma's power multiplier — higher rarities are vastly stronger per slot. Mythic gemmae are the rarest items in the game and define an endgame build.
| Rarity | Stars | Power Mult |
|---|---|---|
| Common | ★ | 1.0× |
| Uncommon | ★★ | 1.25× |
| Rare | ★★★ | 1.5× |
| Epic | ★★★★ | 2.0× |
| Legendary | ★★★★★ | 3.0× |
| Mythic | ★★★★★ | 5.0× (gold-trimmed icon) |
Equippable vs Consumable
Every gemma is one of two types. Understanding the difference is the whole game:
- Equippable — sits in a gemma slot and applies its bonus permanently while equipped. Equip it once and forget it. Examples: Gemma of Opulentia (+5% money), Pantheon's Blessing (+50% enchant procs).
- Consumable — activated for a one-time or timed burst effect, then destroyed. Save these for the moments that matter. Examples: Chronos' Sliver (30s instant-break), Fortuna's Shortcut (skip a rank tier), Apotheosis Stone (skip a full prestige).
You cannot equip a consumable gemma and you cannot activate an equippable one — the command will tell you which to use. Check /gemma info <id> if you are unsure.
Commands
| Command | What it does |
|---|---|
/gemma | Open the gemma GUI — the main hub for equipping, activating, and inspecting your crystals. |
/gemma list [category] [page] | List every gemma you own, optionally filtered by category. Paginated. |
/gemma equip <id> | Equip an equippable gemma so its bonus applies permanently while equipped. |
/gemma unequip <id> | Remove an equipped gemma. |
/gemma activate <id> | Consume a consumable gemma for a one-time or timed effect (e.g. instant-break for 30s). |
/gemma info [id] | With no id: shows all your active bonuses. With an id: shows that gemma's full details. |
/gemma give <player> <id> [amount] | Admin: give gemmae to a player (permission imperiummc.crystals.give). |
/gemma take <player> <id> [amount] | Admin: remove gemmae from a player. |
Checking Your Bonuses
Run /gemma info with no arguments to see every active bonus your equipped gemmae grant, summed across all categories:
- Denarius Boost — bonus % to money income
- Token Boost — bonus % to Auctoritas income
- Beacon Gen — bonus % to Civitas generation
- Enchant Proc — bonus % to pickaxe proc rates
- Rank Discount — % reduction in rank-up cost
- Mine Speed — bonus % to mining speed
- Sell Bonus — bonus % to shop sell prices
To inspect a single gemma in detail, use /gemma info <id> — it shows the category, rarity (with star rating), exact effect, type (equippable or consumable), and how many you own.
Gemma Spotlight
With 42+ named gemmae themed for the Roman world, here are some of the most sought-after crystals in each category:
| Gemma | Rarity | Effect |
|---|---|---|
| Gemma of Opulentia | Common | +5% Denarius per block mined (Economy, equippable). |
| Midas' Vein | Rare | +25% Denarius per block mined (Economy, equippable). |
| Croesus' Legacy | Mythic | +100% all currency gains, permanently (Economy, equippable). |
| Mercury's Swiftstone | Uncommon | +20% mining speed (Mining, equippable). |
| Pluto's Passage | Epic | Pass through stone; only mine ore (Mining, equippable). |
| Chronos' Sliver | Legendary | Activates instant-break for 30 seconds (Mining, consumable). |
| Terra's Endless Vein | Mythic | +100% mining speed permanently (Mining, equippable). |
| Concordia's Shard | Rare | +20% all enchant proc rates (Enchant, equippable). |
| Jupiter's Convergence | Legendary | All enchants simultaneously proc once (Enchant, consumable). |
| Pantheon's Blessing | Mythic | +50% permanent all enchant procs (Enchant, equippable). |
| Centurion's Advancement | Rare | -20% rank and prestige costs (Progression, equippable). |
| Fortuna's Shortcut | Legendary | Skip one rank tier instantly (Progression, consumable). |
| Apotheosis Stone | Mythic | Skip one full prestige level (Progression, consumable). |
| Civitas Ascendant | Mythic | +100% permanent beacon generation (Beacon, equippable). |
| Horrea Infinita | Mythic | Unlimited backpack capacity, permanently (Utility, equippable). |
| Discordia's Gem | Mythic | Random massive event or economy buff (Event, consumable). |
How to Get Gemmae
- Crates — many crate tiers reward gemmae, with the best tiers holding Mythic crystals.
- Voting milestones — top voter Aureus prizes can be spent on gemmae in the store.
- Store — buy specific gemmae at store.imperiummc.net.
- Events — seasonal events often drop exclusive or seasonal gemmae.
- Auction House — buy gemmae other players are selling.
- Achievements & prestige rewards — some milestones grant gemmae directly.
Tips
- Equip the gemma that matches your loop. Mining for money? Croesus' Legacy. Pushing enchants? Pantheon's Blessing. The right gemma doubles your output.
- Save consumables for spikes. Chronos' Sliver during a mining booster, Apotheosis Stone when you are about to prestige, Jupiter's Convergence when your Sarcina is full of high-value ore.
- Gemmae stack with pets and skills. A Gemma of Fortuna + a Golden Goose pet + Mercatura sell perks is how the top miners multiply their income.
- Progression gemmae pay for themselves. Centurion's Advancement (-20% rank/prestige cost) can save you more Denarius than almost any other bonus over a prestige run.
- Check /gemma info after every equip. The summed-bonus view is the fastest way to see what your build is doing.
- Utility gemmae are quality-of-life power. Horrea Infinita (unlimited backpack) means never running back to sell mid-mine again.
Gemmae are the most flexible bonus layer in Imperium — they touch every system from mining to enchants to prestige. A well-built gemma loadout is often the difference between a steady climb and an explosive one.