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July 3, 2025

AK-47 Case Hardened Blue Gem: Complete Guide & Odds

When it comes to rifles in CS2, there’s no debate: the AK-47 is king. But when it comes to AK-47 skins, that’s where things get interesting.

The most valuable AK-47 skin? That would be the Case Hardened: more exactly, the legendary "Blue Gem".

What is a Blue Gem AK-47?

Side-by-side comparison of two AK-47 Case Hardened skins: the left shows a common gold-dominant pattern with minimal blue, while the right features a rare Blue Gem pattern with full blue coverage on the receiver and magazine. Diagram visually highlights the difference in color distribution and tier value.

A 'Blue Gem' refers to Case Hardened skins where the pattern generation resulted in predominantly blue coloring.

For those unfamiliar, each Case Hardened skin originates from a large texture file containing mixed sections of gold, purple, and blue. When generating a new skin, the game randomly selects a number between 1 and 1000, determining which portion of the texture file is applied to the weapon.

Most Case Hardened AK-47 skins feature gold and purple hues with occasional blue patches. However, a few select patterns result in the weapon's most visible areas (like the top receiver and magazine) appearing predominantly blue. These rare patterns are what the community famously calls "Blue Gems."

Due to their rarity and striking appearance, Blue Gems have become highly valuable, with a general rule being: the more blue it has, the greater its value.

What Defines a Blue Gem?

Well, three key factors determine whether a Case Hardened qualifies as a Blue Gem:

Blue Coverage Percentage: The amount of surface area covered in blue coloration
Blue Placement: Blue on the "playside" (top receiver, magazine) carries premium value
Blue Quality: Clean, bright blue is more desirable than darker or mixed variations

How Many AK-47 Blue Gems Are There?

Out of the 1,000 possible Case Hardened patterns, only 146 are classified as Blue Gems, meaning around 14.6% of all Case Hardened skins technically fall under the Blue Gem category.

However, most of these 146 patterns are what the community considers low-tier Blue Gems, with small blue areas or blue in less visible spots, making them less valuable and less desirable.

Among these, there are 13 patterns that have clean, large blue areas on the key parts and are considered premium Blue Gems:

Complete Blue Gem Tier List

Tier 0 ("The Scar")

AK-47 Case Hardened Pattern 661 Blue Gem with full blue top and golden scar near rear sight, iconic Tier 0 skin in CS2. — Pattern #661

Pattern #661

This blue gem represents the absolute pinnacle of AK-47 Case Hardened skins and features near-total blue coverage on the top receiver with a distinctive golden “scar” near the rear sight, creating a level of visual excellence unmatched by any other pattern in the game.

Tier 1 (Elite Patterns)

AK-47 Case Hardened Elite Blue Gem featuring pattern #670 with heavy top-blue and magazine coverage — Pattern #670

#151, #179, #321, #387, #670, #955

These are the patterns that make collectors go absolutely crazy with their exceptional blue coverage on the top receiver.

Pattern #321 stands out for having blue on basically all metal parts of the weapon, giving it that complete coverage look. Meanwhile, #670 is another "scar" pattern that's almost as legendary as #661, featuring similar characteristics that make it incredibly desirable.

The #955 is known as the “Reverse Scar.” It has that beautiful blue top, but with a distinctive golden barrel that creates a sick contrast.

Tier 2 (Premium Patterns)

AK-47 Case Hardened Pattern #4, with Premium Blue Gem skins with strong but partial blue coverage, highly sought after among CS2 collectors. — Pattern #4

#4, #13, #168, #429, #592, #905

Slightly less blue than Tier 1 but still considered premium blue gems.

Tier 3 (High-Quality Blue Gems)

Ak-47 Blue gem with a high quality blue gem pattern #92, featuring some significant blue body coverage, but still a very noticeable half mixed with gold and purple — Pattern #92

#11, #74, #82, #92, #103, #112, #139, #147, #172, #189, #228, #236, #278, #310, #322, #363, #375, #426, #430, #434, #442, #450, #463, #497, #512, #555, #690, #695, #698, #708, #711, #713, #721, #733, #750, #760, #782, #791, #823, #828, #844, #849, #862, #868, #887, #917, #950, #961, #969, #978, #996

Significant blue coverage with noticeable mix of other colors.

Tier 4 (Entry-Level Blue Gems)

#2, #28, #32, #65, #73, #126, #169, #178, #182, #200, #209, #248, #256, #269, #306, #344, #381, #397, #407, #418, #420, #453, #456, #468, #470, #479, #481, #493, #494, #507, #522, #525, #526, #532, #541, #557, #575, #577, #605, #622, #627, #648, #664, #681, #685, #689, #694, #715, #770, #775, #788, #795, #798, #803, #847, #872, #878, #879, #888, #891, #922, #927, #935, #965, #985

Distinct blue patches but predominantly balanced with gold/purple.

How Rare is a Case Hardened Blue Gem?

The odds behind getting a Blue Gem reveal exactly why these items command such high prices. To unbox any Blue Gem from a CS:GO Weapon Case, you need to hit:

1.6% chance for an AK-47 Case Hardened
14.6% chance for a Blue Gem pattern
Combined odds: 1 in 428 cases

To put simply: you'd need to open roughly 428 cases, costing around $58K given the CS:GO Weapon Case's price of $135.50 (case + key), to have a reasonable chance at getting an AK-47 Blue Gem.

The Rarest and Best AK-47 Case Hardened Blue Gem

In game image of the legendary Pattern #661 Factory New, considered the best AK-47 Case Hardened Blue Gem you can get your hands on.

Pattern #661 StatTrak Factory New is widely considered the best AK-47 Case Hardened Blue Gem you can get your hands on.

For fun, we made the math, and if you want get your hands on a StatTrak Factory New Pattern #661, the odds are just astronomical: you need to hit a 1.6% chance for the base AK-47 Case Hardened, then a 10% chance for StatTrak, then the 0.1% chance for Pattern #661, and finally a 7% chance for Factory New condition.

This creates final odds of approximately 1 in 8.93 million cases. And if you decided you wanted to open that many cases assuming that the price would stay at $135.50 per case, you're looking at over $1.21 billion in case opening costs!

This astronomical figure explains exactly why the StatTrak Factory New #661 was called a "phantom grail" for over a decade and why there’s only one in the entire history of Counter-Strike.

Who Owns the AK-47 Case Hardened Blue Gem with Pattern #661 (StatTrak Factory New)?

The singular StatTrak Factory New AK-47 Case Hardened with pattern #661 was sold in June 2024 for a price reported to be over $1 million, making it one of the most expensive CS2 skins ever sold. The deal was handled by prominent skin brokers "zipel" and "roflm0nster."

The buyer's identity remains private, though it's speculated through the community that the new owner is a collector who goes by the alias "Fourteen."

How to Obtain an AK-47 Case Hardened Blue Gem?

There are three primary ways to get your hands on a Blue Gem AK-47, each with different levels of risk and cost.

The first method is case opening, where you buy CS:GO Weapon Cases for around $135 each with roughly 1 in 428 odds of getting any Blue Gem. It's exciting, but generally a very costly and unreliable method.

Trade-up contracts offer a more strategic approach by exchanging 10 lower-tier skins for a guaranteed Case Hardened skin. This method gives you better odds compared to random case openings, but you're still at the mercy of the 1-in-1,000 pattern lottery.

The most reliable method is direct market purchase, where you buy specific Blue Gem patterns directly from other players. While this has the highest upfront cost, it's completely transparent and removes all uncertainty about what you're getting.