M9 Bayonet Case Hardened | Best Blue Gem Seeds (Complete CS2 Guide)

If you’re chasing one of the cleanest flexes in CS2—a true M9 Bayonet | Case Hardened Blue Gem—you’re in the right place. Below you’ll find the best M9 Case Hardened Blue Gem seeds, how the community tiers them, what makes a pattern god-tier, and exactly how to verify a knife’s pattern seed before you buy or sell. We’ll also cover practical buying tips and FAQs to keep you safe and confident in the market.

Quick take: Seed #601 is widely regarded as the undisputed #1 M9 Case Hardened Blue Gem thanks to its near-full-blue playside, with #417 often cited alongside it at the very top.

What Makes A Case Hardened “Blue Gem”?

Case Hardened finishes are generated from a common heat-treated template, but the pattern seed (also called “seed” or “index”) decides which portion of that template lands on your knife. Blue Gem refers to patterns with dominant, clean blue on the playside (the side you see the most in hand), typically with minimal gold or purple “oil” streaks. Community lists group these seeds into tiers based on how much clean blue the playside shows, and the top tiers command massive premiums over regular Case Hardened knives.

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The Consensus Short-list: The Best M9 Case Hardened Blue Gem Seeds

Below are the most consistently celebrated M9 Case Hardened Blue Gems across trusted community lists, with notes to help you triage value at a glance.

Tier 0 / #1 Pattern: The Grail

• Seed #601 — The M9 Blue Gem. Community guides and market comps treat 601 as the definitive #1 thanks to its almost entirely blue playside. Pattern tracking shows roughly 82.5% blue coverage on the playside, which matches what collectors see in-game. It’s also exceptionally scarce; one guide notes no Factory New copies seen and quotes a high-end sale around $68k (always treat price snapshots as indicative, not guarantees).

Top-Tier Rivals

• Seed #417 — A premier Tier-1 Blue Gem frequently mentioned just after 601. Coverage modeling shows ~75.96% blue, putting it firmly in trophy territory.
• Seed #58 — Another classic “near-full-blue” look that many lists push into the highest tiers; modeled blue coverage ~66.96%.

Why these three? Across respected lists and tools, 601, 417, and 58 surface again and again at the very top. If your budget reaches into Tier-1 territory, these are the playside looks most buyers chase.

Extended Tier-1 & Tier-2 seeds (Most Commonly Cited)

Different curators draw the lines a bit differently, but here’s a compact, practical view you can use when filtering markets:

Frequently Cited Tier-1/“Near-Tier-1” Seeds
601, 417, 58, 503, 523, 406, 349, 403 (top grouping often shown together).

Broader Tier-1 Pool (As Some Guides Define It)
58, 107, 150, 239, 253, 349, 354, 403, 406, 417, 449, 503, 517, 523, 550, 585, 634, 675, 897, 946
This larger cut still centers on a dominant blue play side; some curators separate 601 into a special “Tier 0” above all others.

Representative Tier-2 Picks
You’ll often see these called out as strong blue play sides (great “value blue gems”):
239, 107, 150, 897, 837, 715, 345, 224, 346, 281, 915, 430, 610, 202, 698, 585, 750, 59, 449, 959, 113

Pro tip: Coverage percentages from modeling tools (like pattern.wiki) can guide you, but market photos still rule—tiny gold at the tip or heel can move a knife up or down in desirability even if the raw % looks close.

How To Verify A Blue Gem Seed (Step-By-Step)

Before you pay a premium, verify the seed and inspect the play side carefully. Here’s a workflow that traders actually use:

1. Pull The Seed In-Game Or On The Item Page.
   Inspect the skin and look at the info panel; you’ll see the Pattern (Seed) number along with float. Many guides show exactly where to find it.
2. Cross-Check The Seed Against Trusted Lists.
   Compare your seed to established tier lists. If your number is in Tier 1–2, it’s worth deeper scrutiny and better photos.
3. Use A Modeling/Reference Tool For Coverage Clues.
   Tools display seed-specific blue coverage estimates for the M9 Case Hardened (e.g., #601 ≈ 82.56% blue; #417 ≈ 75.96%). Treat these as guides; the actual screenshot is king.
4. Optionally, Use Market Helpers.
   Community workflows often rely on the CSFloat market extension to reveal seeds and filter listings by seed so you can hunt specific patterns efficiently.

Buying, Pricing & Scarcity Notes (Read Before You Trade)

• Don’t Fire-Sale A Blue Gem On Steam.
  Blue Gems regularly fetch above Steam Market norms in private trades/3rd-party markets because the buyer pool is narrower—but much more motivated. If you own one of the seeds listed above, shop it around to collectors.
• Prices Are Volatile & Anecdotal.
  Articles and tweets highlight eye-watering sales (e.g., a high-tier M9 CH 601 cited near $68k), but the only price that matters is the current buyer’s. Screenshot quality, float, sticker history, and backside all influence bids. Use old sales as context, not guarantees.
• Float Still Matters.
  A Factory New-ish Blue Gem typically commands a premium over the same seed in lower wear. Always verify float and seed together, and ask for in-hand screenshots under normal lighting.
• Backside vs Playside.
  On M9 specifically, playside dominance carries most of the value conversation. A weak backside may still be fine if the playside is elite (e.g., #601 is famed for an immaculate playside even though the backside isn’t perfect).

Compact Lists You Can Save (For Quick Checks)

Top-Tier (Most Coveted) M9 CH Blue Gem Seeds

• 601 (grail), 417, 58.

Strong Supporting Cast Often Treated As Tier 1–2

• 503, 523, 406, 349, 403 (commonly grouped just below the top three).
• Wider Tier-1 pool used by some market guides: 107, 150, 239, 253, 354, 449, 517, 550, 585, 634, 675, 897, 946.

Solid “Value Blue” Tier-2/3 Examples

• 239, 107, 150, 897, 837, 715, 345, 224, 346, 281, 915, 430, 610, 202, 698, 585, 750, 59, 449, 959, 113.

Practical Buying Tips (Long-Tail Takeaways)

• Search Terms To Use:
  “M9 Bayonet Case Hardened Blue Gem seed 601,” “M9 CH 417 playside,” “M9 Blue Gem #58 Tier 1,” “M9 CH seed list CS2,” “M9 Case Hardened pattern index check.”
• Verify Everything: Float, seed, in-hand screenshots, stickers, and the account’s trade history if you’re moving serious money.
• Be Patient: True Tier-1 knives, especially #601, appear rarely. If a seller is rushing you, walk away.
• Document The Deal: Use escrow or reputable trading platforms when possible; capture chats and screenshots.

Final Word

The M9 Bayonet | Case Hardened Blue Gem is a pinnacle collector piece in CS2. If you’re hunting, memorize the 601 / 417 / 58 trio, keep a wider Tier-1/Tier-2 list handy for realistic targets, and verify every detail before money moves. With patience—and the right seed—you’ll end up with a knife that turns every inspect into a flex.

FAQ