Doppler Phases Explained: Sapphire, Ruby & Black Pearl
If you have ever looked at two seemingly identical "Karambit Doppler" knives priced ten times apart, the difference is the phase. Doppler is the only finish in CS2 where the same skin name covers wildly different visuals and prices, and getting comfortable with the seven phases is the single most useful skill for anyone trading knives or gloves.
What is a Doppler phase?
When Valve added the Chroma Case in 2015, the Doppler finish was generated procedurally — each unit got a different paint pattern. Internally, CS2 distinguishes them with a numeric paint_index. Seven distinct visual phases emerged, and the community gave them names. The market quickly priced each phase independently because the rare ones look dramatically different from the common ones.
The seven standard Doppler phases
| paint_index | Phase name | Look | Price tier |
|---|---|---|---|
| 415 | Ruby | Solid red | Premium (rarest) |
| 416 | Sapphire | Solid blue | Premium |
| 417 | Black Pearl | Black with iridescent purple | Premium |
| 418 | Phase 1 | Pink + black | Standard |
| 419 | Phase 2 | Pink + purple | Standard |
| 420 | Phase 3 | Black + purple | Standard |
| 421 | Phase 4 | Pink + black + purple | Standard |
Ruby, Sapphire, and Black Pearl are sometimes collectively called the "premium phases". They typically trade for 5–15× more than a Phase 1–4 of the same knife. A Phase 2 Karambit Doppler in Factory New might be $1,200; a Sapphire of the same wear is closer to $7,000. The market hash name is identical for all seven — Steam doesn't distinguish phases at the listing level. You have to inspect the item to find out which one you have.
Gamma Doppler — the same idea, different palette
In 2016 Valve introduced the Gamma Case with a green-toned variant called Gamma Doppler. It uses paint indexes 568–572 and follows the same rare-vs-common split:
| paint_index | Phase name | Look |
|---|---|---|
| 568 | Emerald | Solid green (rare premium) |
| 569 | Phase 1 | Bright green + dark |
| 570 | Phase 2 | Green-blue swirl |
| 571 | Phase 3 | Dark green + black |
| 572 | Phase 4 | Mottled green |
How to identify a phase before trading
Two reliable methods:
- Inspect in CS2. Open the item and look at the blade. The seven phases are visually distinct — Sapphire is unmistakably blue, Phase 2 has a clear pink-purple gradient, and so on.
- Use a price-aware inspect tool. Sites like CSFloat read the paint index from the inspect link and tell you the phase directly. Hostadz reads the paint index from the game coordinator and prints a phase badge (P1, P2, Sapphire, BP, etc.) on every Doppler card so you never have to guess.
Browse phase-priced Doppler knives on Hostadz.com/trade. Every Doppler is checked against CSFloat's filtered listings for that specific paint_index — a Sapphire is never priced as a Phase 4.
Common pricing mistakes
- Treating the trade-up as flat. If a site averages "Karambit Doppler" pricing across all phases, you'll overpay for a Phase 4 and underpay for a Sapphire. Avoid sites that don't surface the phase.
- Confusing Doppler with Marble Fade. Marble Fade is a separate finish with its own pattern tiers (Fire & Ice, Tricolour). Don't conflate the two.
- Ignoring float on premium phases. Even a Sapphire's value depends on float — a 0.005 Sapphire is significantly more valuable than a 0.06 Sapphire of the same knife.
Quick recap
- Doppler has 7 distinct phases identified by paint_index 415–421.
- Ruby (415), Sapphire (416), Black Pearl (417) are premium tier.
- Phases 1–4 (418–421) are standard tier.
- Gamma Doppler is the green variant with paint_index 568–572 and Emerald as its premium.
- Always check phase before trading — Steam's market hash name doesn't distinguish them.
Got more questions on knife pricing? See the related entries in our FAQ, or read our guide on Case Hardened Blue Gems for another pattern-tier deep dive.