What is a CS2 knife pattern index?

The pattern index (paint_seed in the inspect-link protobuf) is an integer 0-1000 that seeds the shader generating a knife's pattern. For Dopplers it determines phase (1, 2, 3, 4, Sapphire, Ruby, Black Pearl). For Marble Fades it determines color distribution (FFI, Max Yellow, Fire and Ice). For Crimson Webs it determines how many full webs appear on each side. Same seed → same pattern, always.

What are the Doppler phases and which are rare?

Standard Doppler has phases 1, 2, 3, 4 plus the special "Sapphire" (deep blue), "Ruby" (red), and "Black Pearl" (black/white). Sapphire / Ruby / Black Pearl trade at 5-15x the common-phase prices. Among the four numbered phases, Phase 2 and 4 are usually the most desirable for aesthetic reasons, but the premium is small (10-30%). Gamma Doppler swaps the rare tier for "Emerald" (deep green) instead of Sapphire/Ruby.

What is a "FFI" Marble Fade and why is it expensive?

FFI ("Fire and Ice") is the tier-1 Marble Fade pattern where the red and blue halves are perfectly separated on the playside (the side you see when held) — a clean blue blade tip transitioning to a red base, with minimal yellow contamination. Only a handful of seeds produce true FFI on each knife type. Karambit FFIs in particular routinely trade at 3-5x the standard Marble Fade price.

How do Crimson Web web counts work?

Crimson Web knives have an irregular black-web pattern over a deep red base. The pattern index determines how many "full" webs (uninterrupted, no edge clipping) appear on each side. Tier classification: Web Count 4+ both sides is highly desirable; Triple Web has 3 full webs on one side; Double Web has 2; Standard has 1 or fewer. A Triple Web Karambit Crimson Web FN can sell for 5-10x the typical Crimson Web price.

How do I look up a specific knife's pattern tier?

You need the pattern_seed from the item. Get it by either right-clicking the knife in your CS2 inventory → Inspect → looking up the inspect link in a decoder, or by checking the listing on a marketplace like CSFloat that surfaces the seed directly. Then cross-reference the seed against a pattern database — CSBlueGem (for Case Hardened blues), Dispattern (broad coverage), or CSGOSkins.gg (named patterns by tier).

CS2 Knife Patterns — Every Rare Doppler, Marble Fade, Crimson Web

Every CS2 knife has a pattern seed — an integer 0 to 1000 that decides exactly how the pattern shader paints the blade. For most finishes the seed is invisible to a buyer; for Dopplers, Marble Fades, Crimson Webs, Case Hardenings, and a handful of others it’s the difference between $300 and $3,000. This guide covers which knife finishes are pattern-sensitive, which tiers command a premium, and how to look up where any specific seed sits.

What “pattern” actually means

A CS2 skin’s appearance is generated, not stored — the paint shader takes (paint_kit, paint_wear, paint_seed) and produces the visible texture every time the item is rendered. The seed is the integer that controls the procedural part: where the colour bands fall on a Doppler, how the marble striations distribute on a Marble Fade, which positions on the blade get web clusters on a Crimson Web. Same seed → identical pattern, always.

That determinism is why "rare pattern" markets exist. A specific seed (#387 on the Karambit Doppler, for example) might consistently produce a particularly clean Phase 4 tip-fade — and traders who know that seed will pay a premium for any Karambit Doppler that rolled it. The seed is part of the inspect-link payload, so it’s public information for every listed item.

To extract a seed from any item, paste the inspect link into the inspect decoder — the paint_seed field surfaces in the parsed output.

Doppler — phases 1-4 plus the rare tier

Standard Dopplers come in seven distinct phases. Four "numbered phases" (Phase 1 / 2 / 3 / 4) — common, 80%+ of all Doppler rolls — plus three rare tier finishes: Sapphire (deep blue), Ruby (red), Black Pearl (black with white pearl flecks). The pattern seed alone determines which phase a given knife rolls.

Approximate rarity (varies a bit by knife type):

Phase 1 / 2 / 3 / 4 — about 20% each, ~80% combined
Sapphire — about 5%
Ruby — about 5%
Black Pearl — about 10%

Price ratios at typical FN/MW grades — Ruby and Sapphire trade at roughly 4-8x a numbered phase; Black Pearl at roughly 3-6x. Phase 2 and Phase 4 carry small aesthetic premiums (10-30%) over Phase 1 and Phase 3 — Phase 2 because it produces the cleanest body fade, Phase 4 because the point of the blade tips into pure red/blue rather than mixing.

Gamma Doppler uses the same numbered-phase structure but replaces the Sapphire/Ruby/Black Pearl tier with a single Emerald (deep green) finish. Emeralds are the rarest of the rare-tier Dopplers across the entire family — a Karambit Gamma Doppler Emerald FN can clear five figures.

Marble Fade — FFI, Max Yellow, and tier 2-3

Marble Fade pours red, blue, and yellow stripes across the blade in a marble pattern. Three named tiers determine the colour distribution on the playside:

FFI (Fire and Ice). Red and blue cleanly separated, minimal yellow contamination on the playside. The "clean" tier — usually a true FFI shows a vertical blue gradient meeting a red base. Only a small handful of seeds produce FFI on each knife type; the lookup tables for FFI seeds are well documented on pattern databases.
Max Yellow. Heavy yellow stripe on the playside — the "anti-FFI" aesthetic some collectors actually prefer. Also rare and traded at premium.
Tier 2 / 3. Cleaner-than-default but not full FFI. Smaller premiums, still meaningfully above the common-pattern floor.

Karambit FFI Marble Fades are the marquee pattern in this family — they regularly trade at 3-5x the typical Marble Fade price. The premium varies by knife type and current market depth; lookups against a live pattern database are essential before paying tier-1 prices.

Crimson Web — web count tiers

Crimson Web (and the cheaper Night Web, which uses the same shader on a blue background) has irregular black-web clumps over the base colour. The pattern seed determines how many full, uninterrupted webs appear on each face of the blade.

Quad Web (4+). Four or more full webs on at least one side. The top tier — true Quad Web Karambit Crimson Webs trade at staggering multiples of the common price.
Triple Web (3). Three full webs on one side. Common premium tier.
Double Web (2). Two full webs. Modest premium.
Standard (0-1). One or no full webs on either side. The floor.

Web counts are usually surveyed by hand and published in tier lists on pattern databases — the shader behaviour at the blade edges makes a programmatic count tricky, so the authoritative lookup is community-curated.

Case Hardened — blue gems

Case Hardened isn’t exclusively a knife pattern (it exists on AK-47, Five-SeveN, and a couple of other base weapons too), but knife Case Hardenings are where the biggest pattern premiums live. The Case Hardened shader mixes blue, purple, and gold panels — "blue gem" patterns are the seeds that produce blade faces predominantly covered in solid blue.

Tier 1 blue gems (90%+ blue playside) are the headline pattern in CS2 — the famous "Karambit Blue Gem #387" and similar seeds trade at six figures at the top. Tier 2 and 3 patterns (60-89% blue, mostly blue, partial blue) sit progressively lower. CSBlueGem maintains the canonical tier tables; we cover its role and others in Best Tools for CS2 Blue Gems.

Fade — 100% / 90% / 80% tiers

Fade knives shift through pink/purple to yellow along the blade. The pattern seed determines where the colour bands fall — and specifically, what percentage of the blade is covered in the rare-tier yellow/purple gradient versus fading into the un-colored steel near the heel.

100% Fade — full coverage, no fade-out to steel
90% Fade — small steel reveal at the heel
80% Fade — more steel visible
Standard / below — the rest

Premium scales with knife type — Karambit Fade 100% is one of the most expensive non-Doppler knife patterns in the game. The percentage is a calculable function of the seed and the shader, so tier tables here are precise rather than community-eyeballed.

Other pattern-sensitive finishes

Worth knowing about, smaller premiums:

Slaughter. Red-on-grey blood-spatter pattern — clean centred patterns (no border bleed, no excessive grey) command a 30-100% premium.
Tiger Tooth. Yellow tiger-stripe — small premium for clean horizontal stripes without diagonals at the tip.
Damascus Steel. Subtle premium for the rare seeds that produce strong visible swirl-grain instead of muddy patterning.
Lore. Engraved gold inlay over deep blue — premium for blade faces where the gold ornamentation pops cleanly.

Workflow: how to actually pattern-hunt

Find candidate listings. On CSFloat or Skinport, filter for the finish (e.g. Karambit Marble Fade). Sort by float ascending if you want FN. CSFloat surfaces the seed directly in the listing card.
Get the seed. If the marketplace doesn’t surface it, grab the inspect link and run it through the inspect decoder — the seed is in the parsed output.
Look up the tier. For Case Hardened blues, CSBlueGem. For Marble Fades, Dopplers, Crimson Webs and others, Dispattern or CSGOSkins.gg both publish tier tables by seed.
Verify visually. Tier classifications are guidance, not law. Open the inspect link in CS2 to see the actual rendered knife. Some tier-2 seeds occasionally produce tier-1-quality patterns depending on lighting in the in-game preview.
Compare to recent sales. Tier doesn’t price the item — the comparable-sales history does. CSGOSkins.gg has the best historical pattern sales database; Buff163 listings are the canonical thin market for top-tier Asian patterns.

Liquidity warning

Rare-pattern knives are thin markets. A Karambit Doppler Sapphire FN might list at $4,000 on CSFloat and not sell for three months. If you’re considering pattern-hunting for trading rather than collecting, the spread + time-to-sell eats most of the rare-tier premium for everything below the absolute top tier. The realistic path: buy at known-fair tier prices, hold across major-tournament hype cycles (where knife volumes spike), sell during demand peaks. Pattern flipping at speed is a part-time job, not a weekend hobby.