★ Survival Knife | Doppler | Ruby

It is one phase of the Survival Knife Doppler finish, released on March 31, 2025 with the Spring Forward update. It drops from the Fever Case as a rare special item. The Survival Knife Doppler (Ruby) runs from 0.00 to 0.08 in float, so it comes only in Factory New and Minimal Wear, and it has a StatTrak version.

Factory New peaked at $1,753 on April 15, 2025 and trades 78% below that peak. It is down 26% over the past year and down 20% over 90 days. Its highest price of the past year was $804. Its all-time low was $380, on October 19, 2026. It first traded around $1,753 in April 2025 and is down 78% since. The CS2 price history API carries the full Survival Knife | Doppler (Ruby) (Factory New) price history.

Minimal Wear costs 1.6 times as much as Factory New, the cheapest wear.

Steam asks the most at $579, 50% above the cheapest Factory New listing on CSFloat.

Doppler comes in four phases, Phase 1 to Phase 4, plus three rarer gem patterns: Ruby, Sapphire and Black Pearl. The pattern seed fixes the phase, and each phase trades as its own item with its own price. Black Pearl is the most expensive phase at $430, and Phase 3 the cheapest at $156.

10 Factory New copies are listed for sale across the four marketplaces. 22 Factory New copies sold in a recent 7-day window. Factory New is liquid and usually sells within hours.

The Doppler (Ruby) finish also comes on the Bayonet, the Bowie Knife, the Butterfly Knife, the Falchion Knife and 13 other weapons. It counts toward the Doppler (Ruby) index.