Doppler and Gamma Doppler knives come in phases: different colour variations of the same finish, set by the pattern. The phase is shown on every PenguinSkins listing next to the finish name.
Doppler
| Phase | Look |
|---|---|
| Phase 1–4 | Black, red, pink and blue mixes in different ratios |
| Ruby | Solid deep red (rare gem) |
| Sapphire | Solid deep blue (rare gem) |
| Black Pearl | Dark purple-black (rare gem) |
Gamma Doppler
| Phase | Look |
|---|---|
| Phase 1–4 | Green and blue mixes |
| Emerald | Solid poison green (rare gem) |
Why gems cost so much
Gems drop far less often than normal phases, and the colour is uniform across the whole blade. That rarity is why a Gamma Doppler Emerald Karambit sits at the very top of our market, next to an aurora in the hero banner.
Tip: phases are about the pattern, not the float. A Factory New Phase 2 and a Factory New Phase 4 have the same wear but very different colours, so always check the phase.


