Case Hardened is one of the oldest finishes in Counter-Strike, and in 2026 it remains one of the most complex, most discussed, and most aggressively traded finish categories in the entire game.
The case hardened blue gem system, where the percentage of blue coverage on the weapon's playside can push the price from a few hundred dollars to over a million, is unlike anything else in CS2's economy. Two Karambit | Case Hardened skins with the same float can differ by $1,499,000 in value. The difference is invisible to most players and everything to collectors.
This Case Hardened guide covers how percentages work, what the tier lists actually mean, which specific patterns command real premiums, what gold bar and scar patterns are, where buyers get burned paying overprice, and where to find Case Hardened skins at fair market value.
Case hardening is a real-world metalworking process where the surface of a metal part is treated to create a harder outer layer while the interior remains softer and more ductile. In CS2, Valve simulated this effect by applying a finish that produces a mottled blue-silver-gold coloration — the result of carbon migration and oxidation across the blade surface.
The finish was one of the original CS:GO skins and has appeared consistently in the game since 2013. It appears on knives (Karambit, AK-47, Five-SeveN, and others), and on the AK-47 specifically — which has its own tier system entirely separate from the knife market.
What makes Case Hardened different from almost every other CS2 finish is that the pattern isn't uniform across copies. Every Case Hardened skin has a paint seed (a number between 0 and 999) that determines exactly where the blue, gold, and grey areas fall on the weapon. Two skins with the same name and the same float can look dramatically different depending on their seed.
The short answer: seed #387.
The Karambit | Case Hardened with paint seed #387 has the highest confirmed playside blue coverage of any Karambit in the game — approximately 99.5% blue on the playside (the side you see when holding the knife). This makes it the most valuable pattern in a tier system where the top seeds already sell for tens or hundreds of thousands of dollars above a standard copy.
For context: an ordinary Factory New Karambit | Case Hardened without a notable seed trades for approximately $598–$1,493. Seed #387 in Factory New has sold for over $1.5 million — a premium of more than 1,000x over a base copy.
This is not an anomaly or a scam price. It reflects the combination of factors that make the Case Hardened market the most pattern-sensitive market in CS2:
Fixed supply: There are only a limited number of #387 Karambits in existence. Every one is already in someone's inventory.
Visible distinction: 99.5% blue vs. 70% blue is obvious at a glance — the value is legible, not imagined.
Prestige: Owning the highest-tier blue gem Karambit is a demonstrable flex in the CS2 collector community.
Investment history: Blue gem Karambits have appreciated consistently. The Karambit #387 knife is tracked and documented — white.market has a dedicated article on the most expensive CS2 skin.
Every Case Hardened skin has a percentage of its playside covered in blue. The playside is the face of the weapon you see while holding it — the side that matters for visual presentation. The backside has its own blue distribution, but playside is what drives the tier system and the premiums.
Blue percentage is determined entirely by the paint seed — it cannot be changed, crafted, or manipulated. When the skin drops, the seed is set. When the float changes (through wear), the colour distribution doesn't.
The percentage scale for Karambit | Case Hardened looks like this in terms of price impact:
Playside Blue % | Tier | Price Impact |
|---|---|---|
88–100% | T1 | +200% to +100,000%+ over base |
70–87% | T2 | +15–200% over base |
Below 70% | T3 | Market price or slight discount |
The premium for T1 seeds is not linear — it accelerates sharply at the very top. Going from 88% to 95% is meaningful; going from 95% to 99.5% (seed #387) is exponential.
These are the confirmed T1 seeds for the Karambit, ranked by approximate playside blue percentage based on community documentation current as of 2026:
Seed | Approx. Playside Blue % | Notes |
|---|---|---|
#387 | ~99.5% | Highest known blue %; above $1 million Factory New |
#470 | ~97.3% | Near-full blue playside |
#269 | ~97.1% | — |
#853 | ~97.1% | — |
#809 | ~97.0% | — |
#888 | ~96.8% | — |
#442 | ~96.6% | — |
#902 | ~96.4% | — |
#776 | ~96.2% | — |
#73 | ~95.7% | — |
#463 | ~94.6% | — |
#510 | ~92.9% | — |
#905 | ~92.8% | — |
#868 | ~88.9% | Lowest T1 threshold |
Note: these figures are from community-maintained databases and represent the best available documentation. Minor discrepancies exist between sources depending on lighting, screenshot conditions, and measurement methodology. Always verify the seed using a dedicated blue gem calculator before purchasing.
Raw blue percentage is the dominant factor — but it's not the only one.
Where the blue appears on the weapon matters almost as much as how much blue there is. For the Karambit, collectors specifically value blue coverage on the curved portion of the blade visible while holding the knife. A seed with 90% blue concentrated entirely in a location that's hidden or partially obscured during normal use is worth less than a seed with 85% blue distributed visually across the most prominent part of the blade.
This is why two seeds with similar blue percentages can trade at different prices — pattern placement adds a subjective layer on top of the objective percentage number.
For the AK-47 specifically (covered below), pattern placement creates entire named sub-categories: scar patterns, gold bar patterns, and full blue patterns that are each tracked and priced separately from raw blue percentage.
The AK-47 | Case Hardened has its own tier system independent of the knife market, and it adds a twist that knives don't have: the gold bar pattern.
The AK-47's playside blue percentage works on the same principles as the Karambit — higher blue coverage on the visible face drives higher prices. T1 AK-47 blue gems can sell for $5,000–$20,000+ in Factory New, versus a base price of approximately $60–$80 for a standard copy.
The gold bar is a horizontal band of gold that runs across the body of the AK-47, visible on specific seeds. A gold bar pattern is considered desirable for aesthetic reasons — the contrast between the bright gold band and the surrounding blue creates a distinctive look that's immediately recognisable.
The most prized AK-47 patterns combine high playside blue with a gold bar in an aesthetically pleasing position. These are the AK-47 Case Hardened skins that command the largest premiums in the rifle market.
The AK 47 Case Hardened scar pattern refers to a visible marking on the AK-47 body — a light-coloured scratch-like mark that runs across the skin. Whether a scar adds or subtracts value depends on community preference, but it's a documented pattern type that affects how seeds are categorised and priced.
While the Karambit and AK-47 get the most attention, Case Hardened appears on several other weapons with their own tier dynamics:
Five-SeveN | Case Hardened — The most valuable blue gem Five-SeveN seeds approach $10,000–$20,000 Factory New for the highest blue-coverage patterns, versus approximately $60–$70 for a base copy.
Flip Knife | Case Hardened — Follows the same blue gem logic. T1 seeds command premiums of 300–500% over base. Lower market liquidity than the Karambit makes pricing more volatile.
Bayonet | Case Hardened — One of the more accessible Case Hardened knives at the T1 level, with premium seeds ranging from $1,000 to $5,000+ in Factory New.
M9 Bayonet | Case Hardened — Premium seeds trade significantly above the Bayonet at T1 level due to the M9's overall higher base price.
The blue gem tier lists are community-maintained, not embedded in any official interface. A seller claiming "blue gem" or "T1" may be listing a T2 seed at T1 prices. The percentage difference between a genuine T1 and a high T2 is visible — but only if you know the seed and check it against a calculator. Always verify the seed before purchasing any skin sold with a blue gem premium.
Two AK-47 Case Hardened skins can have identical blue percentages but different gold bar placement — and different values. A gold bar in a visually strong position is worth more than a gold bar on a less visible part of the receiver. Buyers who compare only percentages without looking at the actual pattern distribution can overpay or underpay significantly.
Lighting, screenshot settings, and post-processing can make a skin appear more blue than it is in-game. The definitive verification method is inspecting the actual pattern index (paint seed) against a dedicated calculator — not accepting screenshots from sellers as proof of blue percentage.
Float and pattern tier are separate variables but interact dramatically at the top of the market. A T1 Karambit in Factory New can sell for 5–10x what the same seed in Field-Tested fetches. The Karambit | Case Hardened float range is 0.00–0.08 (FN only or minimal wear), which limits the scale of the problem — but within that range, every 0.001 of float still matters for the most expensive seeds.
Do not trust a seller's claim about blue percentage without independent verification. The steps to confirm are:
Get the skin's Pattern Index (paint seed) from the item details or inspect link
Look up the seed on csgobluegem.com — it maintains verified tier lists and blue percentage data for all Case Hardened skins
Cross-reference the tier classification and blue percentage against what the seller is claiming
For AK-47s, additionally verify the gold bar position matches any description given
Compare current prices for that specific seed against recent sales data before agreeing to a price
Always ask the seller for the inspect link and verify the seed yourself — seeds are visible in the item details and cannot be faked.
Karambit | Case Hardened (T1 seeds) — The pinnacle of the Case Hardened market. Seed #387 trades above $1 million Factory New. Other T1 seeds typically range from $10,000 to $500,000+ depending on blue percentage.
AK-47 | Case Hardened (T1 blue gem + gold bar) — The premier rifle-category blue gem. Top seeds with strong gold bar placement reach $10,000–$30,000+ Factory New.
Karambit | Case Hardened (T2 seeds, 70–87%) — T2 Karambits trade at premiums of 15–200% over base. The floor for a notable pattern is still thousands of dollars, but the price ceiling is dramatically lower than T1.
M9 Bayonet | Case Hardened (T1–T2) — Among the more liquid premium Case Hardened knives. T1 seeds reach $3,000–$10,000+ FN.
Five-SeveN | Case Hardened (T2–T3) — Entry into the Case Hardened market for players who want the finish without knife prices. Base copies trade around $60–$70 FN, with notable blue gems adding meaningful premiums.
Flip Knife | Case Hardened (T3) — One of the most affordable Case Hardened knife entries. Standard pattern copies are among the cheapest Case Hardened knives available.
Blue gem verification and pattern research are step one — but where you buy determines how much you actually pay.
The Steam Community Market charges a 15% transaction fee on every sale, which is built directly into listed prices. Third-party marketplaces operate at lower fees and typically offer better prices across the board.
white.market is one of the best options for buying Case Hardened skins in CS2:
Lower prices across all Case Hardened skins due to reduced marketplace fees
Pattern index and float displayed on every listing — essential when a single percentage point means thousands of dollars
No randomness — buy the exact seed, condition, and float you want directly
Browse specific T1, T2, and T3 seeds with full details before committing to a purchase
Available across all Case Hardened weapon types: Karambit, AK-47, M9 Bayonet, Five-SeveN, and more
For high-value Case Hardened skins where a seed difference can mean $100,000+, having full pattern visibility before purchasing isn't optional, it's the only way to confirm you're paying the right price for the right pattern.
A blue gem is a Case Hardened skin with an unusually high percentage of blue coverage on its playside — the visible face of the weapon during normal use. The blue percentage is determined by the paint seed and cannot be changed. The highest-tier blue gems are worth many times more than ordinary copies of the same skin.
The Karambit | Case Hardened with seed #387 has approximately 99.5% playside blue coverage — the highest confirmed blue percentage of any Karambit. Combined with the knife's high base value and the fixed supply of specific seeds, the top blue gem Karambits have sold for over $1.5 million.
These are community-defined tiers for Case Hardened blue gem quality. T1 covers the highest blue percentage seeds (roughly 88%+ playside for the Karambit), T2 covers 70–87%, and T3 covers seeds below 70% blue. T1 seeds command the largest premiums; T3 seeds trade near or below standard market price.
A gold bar is a horizontal band of gold coloration that runs across specific parts of the AK-47's body on certain paint seeds. Gold bar patterns are considered desirable aesthetically, and seeds with both high blue coverage and a well-placed gold bar can command significant premiums.
Yes. Float and pattern tier are separate variables but interact significantly on premium seeds. A T1 Karambit in Factory New can sell for 5–10x more than the same seed in a higher wear condition. Always check both the seed and the float before purchasing any high-value Case Hardened skin.
WhiteMarket is consistently one of the cheapest options, with lower fees than the Steam Community Market and full pattern index and float visibility on every listing — which is essential for Case Hardened skins where the paint seed determines most of the value.