Doppler is one finish name that covers seven different looks. Two Karambit | Doppler listings can share a wear rating, sit next to each other in the search results, and be worth ten times apart. The difference is the phase.
What a phase is
Doppler is a metallic marble finish that came in with the Chroma cases. Instead of one paint job, Valve shipped several variants under the same name. Each variant is its own paint kit, and the game picks one when the item is created.
The Steam Market lists them all as Doppler. The phase is not in the item name. It is only visible in the inspect image, in the item’s paint index, and in the small icon Steam shows for that particular copy.
Both Doppler and Gamma Doppler have a float range of 0.00 to 0.08, so they only exist in Factory New and Minimal Wear. Wear shows as fine scratches along the blade edge and tip.
Doppler phases
| Phase | What it looks like |
|---|---|
| Phase 1 | A mix of blue, pink and black, with dark areas breaking the pattern up. |
| Phase 2 | Mostly pink with blue, and little black. The most wanted of the four. |
| Phase 3 | Dark, with blue and a green tint, and almost no pink. |
| Phase 4 | Mostly blue with black, and only small traces of pink. |
| Ruby | Solid deep red with black marbling. No blue, no pink. |
| Sapphire | Solid deep blue with black marbling. No pink at all. |
| Black Pearl | Near black with a purple and green shimmer that shifts with the light. |
Ruby, Sapphire and Black Pearl are the gem phases. They are far rarer than the numbered phases and price accordingly.
Gamma Doppler phases
Gamma Doppler arrived with the Gamma cases and swaps the pink and blue palette for greens. Same idea, same wear range, different colors.
| Phase | What it looks like |
|---|---|
| Phase 1 | Dark green and blue-green in fairly even amounts. |
| Phase 2 | Mostly bright green. Usually the top numbered phase. |
| Phase 3 | Dark green shading toward black, with light green highlights. |
| Phase 4 | Blue-green and teal, with less of the bright green. |
| Emerald | Solid bright green with black marbling. The gem phase. |
Reading the inspect image
Do not judge a Doppler from the market thumbnail. Open the inspect link or the in-game inspect and look at the playside, the side facing you in first person. Then run through this.
- Single color. Solid red is Ruby, solid blue is Sapphire, solid green is Emerald. If there is any pink on a red knife or any pink on a blue one, it is a numbered phase, not a gem.
- Almost black with a faint colored sheen. That is Black Pearl. A dark Phase 3 still shows clear blue; a Black Pearl does not.
- Lots of pink and little black points to Phase 2. Pink and blue with black gaps is Phase 1.
- Mostly blue. Phase 4 if the rest is black, Phase 3 if there is a green tone and the whole blade reads dark.
The paint index settles it when your eyes cannot. Float checker sites read it from the inspect link and print the phase next to the float. Use them.
Pattern within a phase
The phase sets the colors. The pattern index sets where they land on the blade. Two Phase 2 Karambits can be the same phase and look quite different, one with pink across the whole playside and one with a big blue patch right where you look.
This is why Phase 2 listings with a full pink playside go for more than a plain Phase 2, and why some Phase 4 copies with a clean blue playside pull ahead of an average Phase 1.
How the pricing works
The order is broadly the same on every knife, with the gaps changing by model.
- Sapphire usually sits at the top, with Ruby close behind.
- Black Pearl is the rarest of the three gems but does not always price highest. It depends on the knife and on how much the shimmer shows on that blade shape.
- Among the numbered phases, Phase 2 leads, Phase 4 tends to follow, and Phases 1 and 3 trail.
- For Gamma Doppler, Emerald is well above the rest, then Phase 2, then the others.
- Within any phase, a lower float and a good playside pattern add to the price.
Knife shape matters too. A Karambit shows a lot of blade in first person, so the phase is always on display. A Bayonet or a Gut Knife hides more, and buyers pay a little less attention to the pattern on those.
Where buyers get burned
- Paying Phase 2 money for a Phase 1. A Phase 1 photographed from the pink side looks like a Phase 2. Check the whole playside.
- Listings that do not name the phase. If a seller writes Doppler and nothing else, assume the worst until you see the inspect.
- Edited screenshots. A screenshot is not proof. The inspect link is.
- Confusing Doppler with Marble Fade. Marble Fade is a different finish with red, blue and yellow. It is not a Doppler phase and does not price like one.
- Ignoring wear on a knife. A Minimal Wear Doppler at 0.079 has visible edge scratches. On a finish this reflective they stand out.
Before you buy
Ask for the inspect link if it is not already there. Confirm the phase with a checker. Look at the playside, not the backside. Then decide if the price fits the phase, the float and the pattern.
On PrefireSkins every listing is a single specific knife, and you are buying that exact copy with its own phase and pattern. Check it the same way you would check anything else.
