How gems work in Pixel Worlds
Gems are what you earn for actually doing things in Pixel Worlds. Swinging a pickaxe, casting a line. Sooner or later every player ends up staring at a full inventory with the same question: what's all this worth? This guide answers it, and shows how the gemstone calculator and the fish calculator arrive at their numbers.
Where gems come from
Gems aren't dropped as gems. You collect items, gemstones or fish, and trade those in. The distinction matters because what you get back depends entirely on which item you hand over.
Mining, in the Pixel Mines
Gemstones come from the Pixel Mines. You need a pickaxe to start and the Mining Gear NPC inside the mines hands one out free, so there's nothing stopping you. Dig long enough and you'll turn up five types: topaz, emerald, sapphire, ruby and diamond. Each comes in five sizes from tiny up to huge, which makes twenty-five separate items.
You sell them to the gemstone buy bot, also in the mines. It pays in gems, and the amount depends on the stone's type and its size. A huge diamond and a tiny topaz are nowhere near the same transaction.
Fishing
Fishing produces fish, and fish sell for gems the same way gemstones do: by species and by size. There are twelve species, each again in five sizes, so sixty distinct items.
What mgems and fgems mean
Two bits of shorthand come up constantly in trade chat. Mgems are mine gems, from selling gemstones. Fgems are fish gems, from selling fish. Once they're in your account they're the same currency. The labels just say where they came from, which traders care about when they're working out what to offer you.
These aren't the only ways to earn gems. Farming, the Netherworld and plain block-breaking all produce them. But gemstones and fish are the two with a known price per item, so they're the two this site can calculate.
What gems are for
Most players turn their gems into byte coins, which have been the game's main trading currency since June 2021. Nearly every player-to-player deal is priced in them. You can also buy byte coins with real money from the in-game shop, and that's what gives them a floor value worth trading towards.
Here's the part people get wrong. There is no fixed exchange rate between gems and byte coins. Players agree it between themselves and it moves around. That's why both calculators here let you type the rate in instead of baking one in. Use a rate from six months ago and you'll get an answer that was true six months ago.
The maths, exactly
Nothing clever is going on. Both calculators do the same two steps.
total gems = Σ (quantity × gems per item)
byte coins = floor(total gems ÷ gems per byte coin)Step one multiplies each quantity by what one of that item pays, then adds the results up. Nothing gets rounded, because every price and every quantity is a whole number, so the total comes out exact.
Step two divides by your byte coin rate and rounds down. You can't hold part of a byte coin, so 3,664 gems at 10 gems per coin comes to 366 coins with 4 gems stranded, not 366.4 coins. The calculator shows you the 366 and doesn't pretend the remainder counts for anything.
A worked example
Say you come back from a run with a mixed bag: 120 tiny topaz, 64 small topaz, 18 medium emerald, 7 large sapphire, 2 huge ruby and 11 small diamond. Here's step one, item by item:
| Gemstone | Quantity | Gems each | Gems |
|---|---|---|---|
| Topaz (Tiny) | 120 | 3 | 360 |
| Topaz (Small) | 64 | 6 | 384 |
| Emerald (Medium) | 18 | 20 | 360 |
| Sapphire (Large) | 7 | 100 | 700 |
| Ruby (Huge) | 2 | 600 | 1,200 |
| Diamond (Small) | 11 | 60 | 660 |
| Total gems | 3,664 | ||
| Byte coins at 10 gems each | 366 | ||
222 gemstones, 3,664 gems, 366 byte coins and 4 gems stranded. Look at how lopsided that is. Those 2 huge rubies beat all 120 tiny topaz and all 64 small topaz put together. If you take one thing away from the price tables, make it that. The gemstone value guide goes into it properly.
Doing it without the calculator
If you're in game and want a rough figure in your head, start from the biggest items. Count the huge and large stones, value those properly, then treat the tiny and small ones as noise unless you're holding hundreds. You'll usually land within a few percent, which is close enough to tell whether an offer is fair.
When the exact number matters, like agreeing a trade or splitting a haul, use the calculator and send the other person the share link. Both calculators write your quantities into the URL, so whoever opens it sees the same numbers you're looking at.
A word on accuracy
Everything above is arithmetic on a table of item prices. The arithmetic won't change. The table might, because game economies get adjusted, and Pixel Worlds relaunched in March 2026 with its economy reset. Anything on this site that depends on those prices carries a verification date so you can judge for yourself how current it is.