Survival Knife | Doppler Sapphire was added to the game on March 31, 2025, in the Spring Forward update and became one of the rare special items in the Fever Case. The skin was created by Valve. The Survival Knife appeared in the game in 2019 as part of Operation Shattered Web and first received Chroma finishes in the Fever Case.
The blade is coated with metallic paint and decorated with a pattern of translucent wavy lines resembling clouds of smoke. The color scheme includes various shades of blue, forming smooth gradient transitions. The pattern resembles the texture of a sapphire. The handle remains unpainted.
The skin's Float Value ranges from 0.00 to 0.08, which makes Survival Knife | Doppler Sapphire available only in Factory New and Minimal Wear conditions. As the Float Value grows, small abrasions appear on the blade, but they remain almost unnoticeable even at the highest wear levels.
The pattern index affects the placement of the texture on the blade surface.
The quality of Survival Knife | Doppler Sapphire is Covert. The skin is available in a StatTrak version. The skin is part of the Doppler series. Minimal Wear versions are less common than Factory New ones and may cost more. Their higher price comes from the rarity of the condition, not from a better appearance.