Case Hardened Blue Gem – Full Guide (2026)
Case Hardened Blue Gem guide for CS2 in 2026. What blue gems are, how patterns work, tier list, prices from $100 to $2M+, and how to verify pattern seeds.
A case hardened blue gem is a Case Hardened skin with high blue coverage. Every Case Hardened skin gets a random pattern seed (0 to 1,000). Some seeds produce mostly blue. Those are blue gems. The rarer the blue coverage, the higher the price. Prices range from $100 for a budget AK blue gem to $2 million+ for the #387 Karambit.
How Blue Gems Work
Every Case Hardened skin uses a paint seed that determines the color pattern. Blue, gold, and purple mix in different ratios based on the seed number. A “blue gem” is any seed with significantly more blue than average on the visible play side.
Blue Gem Tiers
| Tier | Blue Coverage | Price Range |
|---|---|---|
| Tier 0 (Legendary) | 95-100% | $100,000 to $2,000,000+ |
| Tier 1 | 80-95% | $5,000 to $100,000 |
| Tier 2 | 60-80% | $500 to $5,000 |
| Tier 3 | 40-60% | $100 to $500 |
| Regular | Below 40% | Market price |
Blue Gems by Weapon
| Weapon | Best Pattern | Top Price |
|---|---|---|
| Karambit | #387 | $2,000,000+ |
| AK-47 | #661 | $100,000+ |
| Five-SeveN | #278 | $10,000+ |
| M9 Bayonet | Various | $50,000+ |
For the Karambit specifically, check our Karambit Case Hardened Blue Gem guide.
How to Verify Blue Gems
1. Inspect the skin in-game or via inspect link.
2. Find the pattern seed in the skin’s properties.
3. Check csgobluegem.com or pattern.wiki to verify the tier.
4. Never buy a blue gem without verifying the seed. Scammers swap similar-looking patterns.
Use our CS2 inspect guide for inspection tools. Buy on CSFloat for float and pattern verification.
For CS2 gambling, see our CS2 gambling sites overview.
FAQ
What is a Case Hardened Blue Gem?
A Case Hardened skin with high blue coverage from a specific pattern seed. The more blue, the more valuable. Prices range from $100 to $2M+.
How do I check if a skin is a blue gem?
Find the pattern seed via inspection. Check it on csgobluegem.com or pattern.wiki. Compare blue coverage to known tier lists.
What is the most expensive blue gem?
Karambit Case Hardened pattern #387 at $2,000,000+. Only one Factory New exists.
Can I unbox a blue gem?
Yes. Any Case Hardened drop has a random pattern seed. Blue gem seeds are extremely rare (1 in 617,000+ for any knife blue gem).