CS2 Blue Gems
A blue gem is a Case Hardened skin whose paint seed lands the blue part of the texture on the weapon's visible surfaces. Out of 1,000 possible seeds, only a few per weapon come out mostly blue — and collectors pay enormous premiums for them, from hundreds of dollars for a pistol to reported seven figures for the #1 Karambit. This hub tracks the community-documented top seeds for every Case Hardened weapon and knife.
What Makes a Blue Gem Valuable?
The Case Hardened finish uses a single texture of blue, purple, and gold patches. The paint seed (0–999) decides which part of that texture wraps onto the weapon model, so the seed alone determines how much blue shows. Because the texture is mostly gold, seeds that land heavy blue on the playside are genuinely rare — community tier lists document roughly 50–70 blue-ish seeds per weapon, and only a handful reach the top tier.
Value follows three factors: blue coverage on the visible side, which side the blue is on (playside beats backside on knives), and float — a low-float top-tier seed is the ultimate collectible. Read the full mechanics in our Case Hardened guide, or verify any skin's seed with the float checker.
Blue Gems by Weapon
Each page lists the community-documented top seeds with tier rankings and live CSFloat listings for the exact pattern.
The AK-47 Case Hardened is the blue gem that started it all. Seed 661 — the "Scar Pattern" — is the most famous paint seed in Counter-Strike, and top-tier AK blue gems have sold for six-figure sums.
The Karambit Case Hardened seed 387 is arguably the most valuable CS2 item in existence — the only Karambit pattern with a near fully blue playside, with reported private valuations above a million dollars.
The Five-SeveN Case Hardened is the budget route into blue gems. Seed 278 delivers a near fully blue slide — the best blue-per-dollar pattern in CS2 — at a fraction of knife and AK prices.
The Bayonet Case Hardened seed 555 is regarded as the "true" #1 Bayonet blue gem, with the most blue on the blade. Several documented Tier 1 seeds sit close behind it.
The M9 Bayonet Case Hardened seed 601 is the crown jewel of M9 blue gems, with around 90% documented blue coverage on the blade. It is one of the most expensive knife patterns in CS2.
The Flip Knife Case Hardened has a short list of documented top blue gems, led by seed 670 — a strong blue blade at a lower entry price than Karambit or M9 patterns.
The Gut Knife Case Hardened is one of the cheapest knives to hunt blue gems on. Community pattern lists document seeds 567 and 962 as its best blue patterns.
The Talon Knife Case Hardened has only around a dozen community-documented Tier 1 blue gems. Seed 55 leads the list, with 923 close behind.
The Nomad Knife Case Hardened has a large flat blade that shows blue well. Community lists document seeds 456, 577, and 169 as its top blue gem patterns.
The Classic Knife Case Hardened — the original CS 1.6 knife shape — has community-documented top blue gems at seeds 403, 58, and 681.
Frequently Asked Questions
- What is a blue gem in CS2?
- A blue gem is a Case Hardened skin whose paint seed places an unusually large amount of bright blue on the visible surfaces of the weapon. The Case Hardened texture mixes blue, purple, and gold, and each of the 1,000 possible seeds maps that texture differently — only a handful of seeds per weapon produce a mostly-blue result, which is why blue gems trade at huge premiums over base Case Hardened prices.
- What is the most expensive blue gem?
- The Karambit Case Hardened with seed 387 is widely considered the most valuable CS2 item in existence. It is the only Karambit pattern with a near fully blue playside, and the Factory New example has reportedly drawn offers above a million dollars. On rifles, the AK-47 Case Hardened seed 661 "Scar Pattern" is the most famous blue gem, with documented six-figure sales.
- How do I check if my Case Hardened is a blue gem?
- Find your skin's paint seed by inspecting it with CSFloat's inspect-link checker or the CSFloat browser extension, then compare the seed against community-documented tier lists like the ones on this page. The seed alone determines the pattern — two skins with the same seed always show the same blue placement on the same weapon.
- What is the cheapest blue gem to buy?
- The Five-SeveN Case Hardened is the usual entry point. Its #1 pattern, seed 278, has a near fully blue slide and costs a small fraction of what knife or AK-47 blue gems trade for. Gut Knife and Flip Knife Case Hardened blue gems are the most affordable knife options.
- Does float matter for blue gems?
- Yes. Pattern and float multiply each other: the same blue gem seed in Factory New is worth many times more than in Battle-Scarred, because lower floats keep the blue bright and unscratched. The most valuable blue gems combine a top-tier seed with a very low float.