Blue Gem (Case Hardened)

The most famous pattern chase in Counter-Strike — Case Hardened skins with a sapphire-blue playside.

A Blue Gem is a Case Hardened skin whose pattern places large, unbroken areas of sapphire blue on the weapon's visible side. Case Hardened textures mix blue, purple and gold at random — the rare seeds that land almost pure blue on the playside are the most chased patterns in the game.

What makes a top-tier Blue Gem

• Playside coverage: the side you see in first person counts most; backside blue adds less.
• Clean composition: unbroken blue beats scattered patches; gold "islands" lower the tier.
• Community tiers: collectors rank seeds in tiers (Tier 1 = best). Skinventory's pattern pages document tiered seeds with sources.

Famous examples

The AK-47 Case Hardened pattern #661 is the most famous Blue Gem — a specimen has traded for a seven-figure sum. Karambit #387 ("the Blue Gem Karambit") holds similar legend status among knives.

Check your own pattern

Own a Case Hardened? The pattern checker tells you instantly whether your seed is documented as notable — no manual digging through guide tables.

Frequently asked questions

What is a Blue Gem in CS2?

A Case Hardened skin whose random pattern shows large areas of solid blue on the playside. The rarest examples are among the most valuable items in Counter-Strike.

What is the most expensive Blue Gem?

The AK-47 Case Hardened pattern #661 in high condition is the most famous — one sale reportedly reached over a million dollars.

How do I know if my Case Hardened is a Blue Gem?

Check the pattern index against community tier lists — or use Skinventory's pattern checker, which matches your seed automatically.