Cut a Gem How to Increase Purity

Purity is the stat that turns Cut a Gem from a clicking toy into an economy engine. Buyers pay exponentially more for high-purity gems, and negotiation ceilings rise with it. This guide explains every lever—grinders, geodes, conveyor order, totems, rebirth, and math tools—so you stop accepting lowball offers. Start from Getting Started if purity numbers still confuse you.

Low purity usually means mismatch: feeding geodes your line cannot finish, skipping grinder upgrades, or running gems to buyers before the last grinder in chain. Fix upstream before reading Buyer Negotiation.

How purity is generated

Geodes enter conveyors with base quality. Each grinder pass adds purity up to that unit’s cap and speed. Final gem purity is the chain output, not the average of machines. One weak grinder clamps the whole line.

Think in sequences:

1. Geode tier sets input ceiling.
2. Grinder tiers set per-pass gain.
3. Totems multiply segments they touch.
4. Rebirth perks add global or grinder-specific bonuses.

Use Purity Calculator before buying a $50k grinder you only needed for one missing tier step.

Greatest jewel purity run in Cut a Gem

Grinder upgrades (biggest lever)

Consult Grinders Tier List for breakpoints. Mid-tier jumps often beat skipping two levels if cash is tight.

Rule: Upgrade the slowest grinder in your chain first—the bottleneck dictates effective purity per minute.

Rule: When adding parallel lines, duplicate full chains instead of sharing one weak grinder across two feeds unless layout guide says otherwise.

Pair purchases with Conveyor Layout so upgraded grinders never starve for geodes.

Geode selection

Higher geodes are not always better. Geodes Tier List ranks by purity-per-dollar at your current grinder set.

Over-tier geodes stall in queues, under-tier geodes cap payout. After Rebirth, revisit geode rank because global multipliers shift math.

Totems and purity

Totems that boost grinder speed or purity belong adjacent to highest traffic nodes—details in Totems Guide and Totems Tier List.

Code rewards like 1MVISITS from Codes Hub grant totems early; misplacement wastes more value than a bad geode purchase.

Conveyor order tricks

Serial grinding beats parallel when each grinder adds fixed percent—order machines lowest to highest tier along path so gems enter weak grinders first. Layout exceptions for offline throughput are in Offline Farming—sometimes you sacrifice peak purity for tick length.

Avoid cross loops that send gems backward unless patch notes document intentional synergy in Latest Patch.

Rebirth and long-term purity

Rebirth resets parts of progression but keeps meta bonuses that raise purity ceilings. Reset too early and you lose grinder tiers; too late and you leave multiplier months on table. Full timing in Rebirth Guide.

Measurement workflow

1. Run one geode batch without selling.
2. Record output purity at chain end.
3. Upgrade weakest grinder one tier.
4. Repeat batch under same geode tier.
5. Compare delta divided by cost.

If delta is tiny, next bottleneck is geode tier or totem buff—not another duplicate grinder.

Common purity mistakes

See also Beginner Mistakes: selling before final grinder, ignoring totem radius, rebirthing before stable chain, using scripts that desync grind ticks (Scripts Hub).

Target purity by progression stage

Stage	Focus
Early	Reach buyer minimum
Mid	Beat first negotiation bracket
Late	Maximize rebirth currency per hour
Offline	Enough purity that offline ticks still sell

Related resources

• Guides Hub —Full curriculum.
• Tier List Hub —Rankings overview.
• Wiki Overview —Cross-category index.

Purity is measurable. Grind smarter, not longer—then negotiate like prices matter, because they do.

Patch awareness

When grinder coefficients change in Latest Patch, rerun your calculator spreadsheet before deleting machines. A grinder that was mid-tier yesterday may become S-tier overnight, flipping optimal chain order. Keeping notes in Wiki Overview bookmarks saves rebuild time after balance passes.