The Most Expensive CS2 Knife: Offers, Listings and Actual Sales (Sep 2026)

The most expensive CS2 knife is the Factory New Karambit Case Hardened pattern #387, the "Blue Gem", valued at $1.5–2 million on the strength of a reported $1.2 million offer its owner refused — and it has never sold in public, so it has no price. The most expensive knives you can actually buy on 9 September 2026 were Emerald, Ruby and Sapphire Doppler phases on the Karambit, M9 and Butterfly at $4,400–17,300, a Karambit Crimson Web at $6,400+, and one StatTrak Skeleton Knife Crimson Web listed around $17,000.

This file keeps those three categories apart: offers and valuations, listings, and confirmed prices. Most lists blur them, which is how "the $1.5 million knife" became a fact.

The Blue Gem: an offer, not a sale

Karambit Case Hardened #387 is the one Factory New copy of the pattern with an almost fully blue play side, held by a Chinese collector who has publicly refused offers including a reported $1.2 million in Bitcoin. Marketplace blogs and collector estimates put its value at $1.5–2 million. Every source we read in September 2026, including one marketplace's own "most expensive" list, says the same thing in the fine print: there is no verified public sale, so the figure is a valuation.

That does not make the knife worthless; it makes it unpriced. Ordinary Karambit Case Hardened copies were $1,540–1,870 in Factory New and $615–685 worn on the check-date, and the blue-gem seeds sit on a separate ladder priced by pattern index and blue coverage, where a single seed can be a multiple of the base price. The Karambit file covers the standard ladder.

Emerald, Ruby, Sapphire: the phases that actually trade

Gamma Doppler Emerald and Doppler Ruby and Sapphire are the top of the tradeable market because they are pattern-locked: the phase is fixed at drop, the float cap is 0.08, and supply is a fraction of a percent of all Dopplers. On 9 September 2026 the Karambit Ruby ran $7,300–11,600 on 255 listings and the Sapphire $4,400–13,000 on 274 — deep enough books that these are real prices, not one seller's hope. The Butterfly Emerald's lowest blended ask was $7,824 on 8 September with listings to $17,300.

The Karambit Emerald is thinner. A third-party list dated 17 August 2026 estimated a Factory New copy at about $14,000, and we did not read a confirmed lower ask, so it is printed as an estimate. The same list put the M9 Ruby around $8,000, the M9 Emerald around $7,500 and the Butterfly Sapphire around $6,500. What these phases did not do is crash: none of them bottomed near the 24 October 2025 lows that every standard Fade and Doppler hit, which is the strongest evidence that the trade-up update repriced supply, not desire.

Crimson Web: the finish that went up after the crash

The Karambit Crimson Web is the one headline finish whose all-time high is dated after the trade-up update: $18,007 on 16 November 2025. On 9 September 2026 the lowest Factory New ask was $6,400+, up 28.8% over thirty days, while the same finish in Field-Tested was $590 and in Battle-Scarred $530. The reason is float: Crimson Web's range is 0.06–0.80, so Factory New copies are genuinely rare, and the ones with a clean centred web on the play side are a collector market of their own.

The StatTrak Skeleton Knife Crimson Web sits in the same logic taken further — a 2019 shape with 25 finishes, a rare StatTrak Factory New, and one listing near $17,000 on a third-party list in August 2026. It is a listing, not a sale, and we print it as one.

The most expensive knife by shape, and by base finish

By shape, the Karambit: its worn Safari Mesh floor was second to the Butterfly's on 9 September 2026 ($365–380 against $408–428), but every record — the Blue Gem, the Emerald estimate, the Crimson Web high, the Ruby and Sapphire books — sits on the Karambit. By base finish, the Butterfly: its Fade was the most expensive standard-finish knife we read at $2,100–2,250 in Factory New, ahead of the Karambit Fade at $1,750–1,850. The Butterfly Knife file prices that ladder.

By history, the Karambit Fade: $5,543 on 6 May 2025, the highest confirmed ask we found for any non-phase, non-pattern knife, before the update cut it to $1,151 on 24 October. Where every shape sits now, floor to grail, is in all CS2 knives ranked with dated bands.

How to read a record-price claim

Three questions sort every headline. First, is there a transaction — a marketplace sale record, or a trade with both sides confirmed — or only an offer, an appraisal or a listing? Most seven-figure claims in this market are the second kind. Second, what are the wear and float: a Factory New pattern-locked phase at 0.01 and the same phase at 0.07 are different assets, and record claims routinely omit the number. Third, what is the date, because a sale in May 2025 and a listing in September 2026 describe two different markets on either side of the trade-up update.

The Blue Gem fails the first test, the StatTrak Skeleton is a listing, and the Emerald, Ruby and Sapphire figures above are the only ones with enough depth to call prices. Anyone quoting a record without those three fields is passing along a rumour with a dollar sign on it.

Where the five-figure knives are sold

On P2P markets with float, phase and pattern data on the listing, because on these items the pattern index is the price. CSFloat charges sellers 2% and shows all three fields; Skinport charges sellers 6% above €1,000 and buyers nothing; DMarket runs around 2% on liquid items and up to about 10% on illiquid ones, which five-figure phases can be. Trade Protection since July 2025 makes any trade reversible for seven days, and P2P markets credit sellers about eight days after delivery — at $10,000 that week matters. Listings: CSFloat, Skinport, DMarket, white.market, SkinBaron, Lis-Skins. Some are affiliate links that may pay us a commission at no cost to you; they never change a band, and none is a case-opening site.