Cut a Gem Gems Tier List
Finished gem types, purity brackets, and when to sell for cash versus keep a showcase piece — the companion to geode sourcing.
Geodes decide what enters your factory; gems are what buyers pay for. In Cut a Gem by Gem Traders, every finished gem carries a purity percentage and a visual type tied to the ore you fed the line. This page ranks finished gem outcomes by economic value, negotiation leverage, and flex potential — complementary to the Geodes Tier List, which answers what to buy, while this page answers what you should do with the output.
Return to Tier List Hub for ranking philosophy. Gems are judged on sale bracket, buyer patience windows, inventory risk, and showcase rarity — not sparkle alone.
How finished gems differ from geodes
Geodes are consumable inputs. Gems are inventory outputs. A Dark geode might become a high-purity amethyst-class gem or a mid-tier crystal depending on grinder chain, totem placement, and luck modifiers. Purity is the universal stat buyers read first; gem type often sets the baseline before multipliers apply.
If purity math still feels abstract, read Increase Purity before this tier list. When you need numeric previews, run the Purity Calculator with your actual grinder and totem bonuses.
S Tier — sell immediately at peak bracket
High-purity Dark output (85%+ band)
Dark-sourced gems pushed into the upper purity band are the mid-game money printer. They appear frequently once your slowest grinder is A-tier or better and totems cover the bottleneck segment. These gems belong in S-tier for cash flow, not rarity — negotiate aggressively using tactics from Buyer Negotiation and reject lowballs when patience allows.
Dark output at 85%+ typically beats holding for a hypothetical Prismatic batch you cannot process yet. Sell, reinvest, repeat the loop in Make Money.
Prismatic-class gems at stable throughput
When your line reliably finishes Prismatic geodes without belt stalls, Prismatic gems enter S-tier for both purity ceiling and buyer offers. They are not flex pieces — they are payroll. Only downgrade to A-tier if your calculator shows diminishing returns versus the next grinder upgrade.
A Tier — strong sellers with optional flex
Crystal-tier gems (70–84% purity)
Crystal-line gems in the 70–84% bracket are the training ground for negotiation. New players exiting tutorial ore should bulk-sell Crystal output while learning counter timing. At this band, one rejected offer rarely bankrupts you — perfect practice before Dark batches matter.
Crystal gems stay A-tier forever as budget inventory: sell when cash is low, hold briefly if a known high-patience buyer spawns.
Radiant event variants
Event-tinted radiant gems sometimes carry bonus buyer interest during limited windows. Treat them as A-tier event sells — cash out before the buff expires unless patch notes on Updates Hub document permanent rarity.
B Tier — situational keep or sell
Basic-starter gems (under 70%)
Low-purity starter gems fund your first grinder duplicates but should not clog inventory mid-game. B-tier means “sell unless you are literally broke and need any offer.” Keeping Basic output for flex screenshots wastes collection space better used for Dark stockpiles.
Mixed-batch leftovers
When you swap geode tiers mid-session, leftover gems from the previous tier often land in B-tier limbo — not high enough for peak offers, not worthless enough to trash. Sell in bulk before switching belts to avoid negotiation confusion.
C Tier — showcase candidates
Near-cap purity gems (95%+)
Gems brushing the 100% purity cap Gem Traders advertises are C-tier economically because buyer RNG may already pay well — but emotionally they are trophy pieces. Keep one per rebirth cycle for showcase plots or community screenshots if inventory allows.
Do not hoard ten near-cap gems while your conveyor still runs Crystal geodes. One trophy, rest sold.
Rare color variants (unconfirmed global buff)
Occasionally players report unusual gem colors from event geodes. Without a confirmed global buff in Latest Patch, treat color variants as C-tier maybe flex — pretty, not proven income.
F Tier — trap behaviors
Selling before final grinder pass
Gems pulled mid-chain read lower purity forever. That is F-tier behavior — always let gems exit the last grinder before opening buyer UI.
Holding low-purity Prismatic for “future value”
If your line cannot finish Prismatic geodes efficiently, the output purity stays low. Holding those gems “until you upgrade” ties cash in dead inventory. F-tier — sell or fix the grinder mismatch first.
Purity brackets and buyer psychology
Buyers scale offers nonlinearly. Small purity gains at low brackets barely move price; the same +5% near 90% can jump a whole negotiation tier. Use this mental model:
| Purity band | Typical action |
|---|---|
| Under 70% | Sell fast, reinvest grinders |
| 70–84% | Practice negotiation, steady income |
| 85–94% | Primary sell tier mid-game |
| 95%+ | Sell unless flexing or event buff |
Cross-check live offers against calculator bands before accepting.
Sell versus show-off decision tree
Ask in order:
- Does selling fund the next bottleneck grinder? If yes, sell — always.
- Is this gem type repeatable tomorrow? If yes, sell duplicates; keep one optional trophy.
- Is inventory near cap? Sell lowest bracket gems first.
- Are you pre-rebirth? Liquidate high-purity stockpiles per Rebirth Guide — flex gems reset value if cash wipes.
Show-off gems belong on the plot, not in a full inventory blocking offline ticks from Offline Farming.
Codes and gem quality
Redeeming 1MVISITS on Codes Hub grants $25,000 cash plus totems — totems shift your gem tier list overnight by raising purity on the same geode inputs. Place totems before judging whether Dark output deserves S-tier or A-tier status.
Related pages
- Geodes Tier List — Input sourcing ranks.
- Increase Purity — Raise brackets before selling.
- Buyer Negotiation — Maximize offers on S-tier gems.
- Purity Calculator — Model brackets before bulk sells.
- Make Money — Reinvest gem profits efficiently.
Gems are the scoreboard your factory prints. Rank them by cash first, flex second — then geode tiers and grinder upgrades align naturally.
Frequently Asked Questions
Quick answers to the most common questions.
What is the best gem to sell in Cut a Gem mid-game?
High-purity Dark-sourced gems in the 85%+ band are the default S-tier sellers. They balance frequency and buyer offers once grinders keep up with Dark geodes.
Should I keep high-purity gems for showcase?
Keep at most one near-cap gem per rebirth cycle if inventory allows. Sell duplicates — cash funds grinders faster than screenshots.
How does purity affect gem tier value?
Purity drives buyer brackets nonlinearly. Small gains at high purity matter more than large gains at low purity. Use the purity calculator before bulk sells.
Do gem types matter beyond purity?
Purity is primary. Gem type sets baselines and occasional event bonuses, but buyers scale mainly on purity percentage and negotiation timing.
How do totems change which gems are S-tier?
Totems raise purity on existing geode inputs, pushing mid-tier output into higher sell brackets. Place totems before re-ranking your gem sell priorities.