What "phase" actually means
Each Doppler skin is generated from a pattern index — a number Valve assigns when the item drops. The pattern index slots into one of seven visual "phases" with hard-coded probability weights. The phase is baked in at drop time and never changes: a Phase 2 stays Phase 2 forever even after dozens of trades.
Phases differ in colour and contrast, not pattern. Two Phase 1 Bayonets will have identical colour distribution; their float values (the wear number) differ but the phase doesn't.
The standard 4 phases — what you see and what you pay
Standard Doppler drops on Bayonet, Flip Knife, Gut Knife, Karambit, M9 Bayonet and most operation knives. The four numbered phases each carry roughly equal drop probability, but pricing differs by phase because some look better than others — particularly on the Karambit and Butterfly Knife where Phase 2 dominates the secondary market.
Phase 1 — pink + black
The "default" Doppler. Pink and black streaks dominate the blade. Generally the cheapest of the four, but on the Karambit the Phase 1 is genuinely beautiful and prices climb sharply at low floats.
Phase 2 — deep blue + pink
Heavily blue with pink accents. The collector's choice on Karambits and Butterflies — typically the most expensive standard phase on these two knife models. On most other knives Phase 2 prices roughly match Phase 4.
Phase 3 — pink + black + green
The phase with a hard green streak. Splits opinion — some collectors love it, others avoid it. Usually priced second-from-top among the standard four.
Phase 4 — pink + black + light blue
Softer colour palette than Phase 2. Often the second-cheapest after Phase 1, though on certain knife models (especially the M9 Bayonet) Phase 4 trades higher than Phase 3.
The three rares — Ruby, Sapphire, Black Pearl
These three phases share the same drop pool as Phase 1-4 but with roughly 1/50th the probability. They display as near-solid colour: Ruby is solid red with minimal black streaks, Sapphire is solid blue, Black Pearl is white-pearlescent with black accents. Combined, the three rares make up under 5% of all Doppler drops.
Pricing on the rares is dominated by the knife model. A Bayonet Ruby in Factory New starts around $6,000; the same Ruby on a Karambit is $25,000+. Sapphire on knives like the Talon or Stiletto can outprice Ruby thanks to limited supply.
Gamma Doppler — the second family
Released with the Gamma Case, Gamma Doppler is structurally identical: 4 numbered phases plus one rare (Emerald, solid green). Visually all four phases lean greener than standard Doppler — even Phase 1 Gamma has substantial green tones whereas Phase 1 standard is pink-dominant.
Gamma Doppler exists on Bayonet, Karambit, M9, Butterfly, Bowie, Falchion, Flip, Gut, Huntsman and Shadow Daggers. There is no cross-finish equivalence: a "Gamma Doppler Phase 2" and a "Doppler Phase 2" are different items with different markets.
What to look at before buying
- Phase confirmation. Listings always include the phase in the title. If it's missing assume Phase 1 — but verify via inspection link before paying a Phase 2 premium.
- Float. Doppler caps at 0.08. Under 0.01 commands significant premium on knife models with visible pattern differences (Karambit, Butterfly).
- StatTrak. StatTrak Dopplers exist and add roughly 15–30% to the price. They're not a separate phase — any phase can be StatTrak.
- Phase scarcity by model. Some knife + phase combinations are very thinly traded. If a Talon Ruby has 3 active listings, the floor price is mostly driven by which 3 sellers are online — verify against recent sale history before assuming the asking price is "the price."
Browse Doppler knives in the catalog
Our live catalog lists every Doppler and Gamma Doppler knife with current marketplace prices. Look for the Phase label in the spec grid on each knife page; where we have authoritative paint-index data we display the exact phase, otherwise the field shows "—".
Common entry points: Karambit, Bayonet, M9 Bayonet, Butterfly Knife. Or filter the Knives rarity hub by collection to surface every Doppler-eligible knife.