Gems are the premium currency in Make a Drill Farm, and they only unlock at the Black Market. You spend them on Mutation Cells, Oil Sprays, Gem drills, and time-skip Clocks, which means most of your progress past the early game runs on how quickly you can build a Gem balance. The good news is that you never have to spend Robux to earn them.
Quick answer: Earn Gems for free by claiming Daily and Weekly Quest rewards, taking your free wheel spin every 30 minutes, and placing a Gem Extractor, Crystal Harvester, or Prismatic Bore in your base to mine Gems while you play.
Claim Daily and Weekly Quest rewards
Quests hand out the largest steady supply of Gems in the game. Open the quest menu through the Quests NPC or the Quests button on the left side of your screen, then check off the tasks listed under the Daily and Weekly tabs.
Most objectives overlap with things you already do while grinding, such as using the drill spin, buying Totems, running the Golden Machine, and staying in a session for a set number of minutes or hours. Because of that, you rarely need to go out of your way to finish them.
Daily Quests refresh every 24 hours and Weekly Quests reset every 7 days, so you get a fresh batch of rewards on a fixed cycle. You will know a quest paid out when the Gem counter above your money in the bottom-left corner ticks up after you claim it.
Tip: The Reset All button refreshes your quests before the timer runs out, but it costs 12 Robux each time, so save it for when a full new set is worth the spend.
Take the free wheel spin every 30 minutes
A small wheel spin icon sits in the top-right corner of the screen. Clicking it opens a wheel that can land on Cash or Gems, and you get one free spin every 30 minutes. Setting a habit of spinning whenever it resets adds up over a long session.
The Gem outcomes and their odds are fixed, so you can plan around what a good spin looks like.
| Reward | Chance |
|---|---|
| 150 Gems | 15.3% |
| 250 Gems | 9.1% |
Place Gem drills to mine Gems passively
Once you have a starting stock of Gems, the smartest reinvestment is a Gem drill. These are bought from the Black Market with Gems, then installed in your base where they produce more Gems on a timer. They only run while you are online, so they will not earn anything during offline sessions.
There are three tiers. Each costs more Gems up front but pays back a higher hourly rate, so upgrade as your balance grows.
| Gem Drill | Price | Production |
|---|---|---|
| Gem Extractor | 1.8K Gems | 72 Gems / 60 min |
| Crystal Harvester | 7.2K Gems | 180 Gems / 60 min |
| Prismatic Bore | 21.6K Gems | 360 Gems / 60 min |
Buying Gems with Robux
If you would rather skip the grind, Gems are also sold for real currency. Open the Quests icon, then click the Gems Shop to see the bundles. The largest option gives you up to 6.9K Gems for 399 Robux. This is optional and none of the Black Market items require it.
Where to spend your Gems at the Black Market
Gems have a single purpose, which is buying from the Black Market. The Black Market is a timed event that opens twice every hour and stays available for 10 minutes each time, so keep an eye out and be ready to spend when it appears.
To get the most value from a limited Gem balance, prioritize purchases in this order.
- Mutation Cells — add a specific mutation to a drill for a permanent boost to its ore output, which is the fastest route to more Cash.
- Oil Sprays — temporarily raise a drill’s ore production, handy for pushing income during an active session.
- Gem drills — the Gem Extractor, Crystal Harvester, and Prismatic Bore keep your Gem income flowing while you play.
- Clock — time skips that speed up drill installation, mostly worth it for late-game drills.
Focusing your early Gems on Mutation Cells feeds directly back into your ore and Cash income, which in turn lets you afford bigger Gem drills sooner. Pair that loop with regular quest claims and a wheel spin every half hour, and your Gem balance climbs without a single Robux spent.
