What the pattern index actually is
When a skin is created — unboxed from a case, won from a trade-up, or dropped after a match — the game rolls two separate numbers. One is the float (the wear value); the other is the pattern index, an integer between 0 and 999. Valve's data calls it the pattern index; the trading community almost always calls it the paint seed. Both names point at the same value.
Think of the seed as the input to a deterministic recipe. The skin's finish is a flat texture that gets wrapped onto the 3D weapon model, and the seed fixes exactly how that wrap is positioned, rotated and offset. The same seed always produces the same placement — it is not random once assigned. Two copies of a skin sharing a seed look pattern-identical (ignoring wear), and like float, the seed is baked in permanently and can never be changed.
Paint seed vs float vs phase
These three terms get mixed up constantly, so it helps to separate them cleanly:
- Float (paint wear) — a 0.00–1.00 decimal that controls how worn the skin looks and which exterior tier it falls into. This is condition.
- Pattern index / paint seed — a 0–999 integer that controls where the pattern sits on the model. This is placement.
- Phase — not a separate roll at all. For finishes like Doppler, the phase (Phase 1–4, Ruby, Sapphire, Black Pearl) is derived from the paint seed. The seed decides which colour variant you get.
The key point: float and seed are independent. A skin can have a flawless float and a dull seed, or a battered float and a legendary seed. For the full breakdown of wear, see our CS2 float value guide.
Why the seed is irrelevant on most skins
For the large majority of finishes, the artwork is broadly uniform — a solid colour, a repeating texture, or a design that looks essentially the same wherever it lands. On these skins, shifting the pattern by one seed is invisible. Nobody pays more for seed 042 of a plain finish than seed 777, because they are indistinguishable in-game.
That's why, for everyday buying, you can ignore the seed entirely and focus on the finish, the wear tier and the price. The seed only becomes a price factor on a specific set of pattern-sensitive finishes — and on those it can be everything.
The finishes where the seed is everything
A handful of finishes are built so that pattern placement dramatically changes the look. On these, the paint seed is the difference between a cheap copy and a grail:
- Case Hardened "blue gems" — the blue/gold marbling is placed by the seed, so a few seeds yield a near-fully-blue playside that collectors hunt for. See blue gem patterns.
- Fade percentage — the seed sets how much of the gradient reaches the tip, expressed as a percentage. See fade percentage.
- Marble Fade "Fire & Ice" — only certain seeds arrange red and blue in the prized layout. See Marble Fade patterns.
- Crimson Web & Slaughter — the seed decides whether the webs or red blots land centred and clean or scattered off-model.
- Doppler phases — the seed determines the phase and rare variants like Ruby and Sapphire. See Doppler phases.
Pattern tier lists and how seeds get ranked
Because only a few seeds produce a special result, the community builds pattern tier lists — crowd-sourced charts that map specific seed numbers to desirability for a given finish. For Case Hardened knives, for example, tier lists rank seeds by how blue the playside and backside are, with the very top seeds (like the famous "Blue Gem" knife seeds) treated almost as named collectibles.
These lists are conventions, not official Valve data — they reflect what collectors have catalogued over years of trading. When you shop a pattern-sensitive finish, the seed number is the first thing serious buyers check, often before float. Browse the wider vocabulary in our CS2 skins glossary.
Why a top seed can cost 100× a normal copy
The maths is simple supply and demand. There are only 1,000 possible seeds, and on a finish like Case Hardened maybe a dozen of them produce a truly blue result. That makes a top-seed copy genuinely scarce — far rarer than a low float, which any number of copies can share. When a finish has thousands of buyers chasing a handful of seeds, the price of the best examples detaches completely from the "base" skin.
This is why a knife that costs a few hundred in an ordinary seed can sell for a five-figure sum on a legendary one. Our valuations reflect this: rather than averaging blindly, our own in-house algorithm reads the live multi-market price grid across 41 marketplaces, so pattern-driven premiums on standout seeds show up in the numbers instead of being smoothed away.
How to find a skin's pattern index
Reading the seed is straightforward. Every tradeable skin exposes an in-game inspect link, and the pattern index is encoded in it. Most marketplace listings show the pattern (alongside the float) in the item's spec panel, and third-party inspector tools read it directly from the inspect link. If the skin is already in your inventory, right-click it in-game, copy the inspect link, and paste it into an inspector to reveal the seed.
For a full walkthrough of inspect links and the tools that decode them, see how to check a skin's float — the same tools surface the pattern index. Then cross-check against the live prices in our skins catalog to see whether a seed's premium is real, and explore standout finishes among our knives.
Paint seed, in one sentence
The pattern index (paint seed) is a permanent 0–999 integer that fixes where a skin's texture lands — irrelevant on most finishes, but on pattern-sensitive ones it decides blue gems, fades, phases and the difference between a cheap copy and a collector's grail. Always check it before paying a pattern premium.