The Complete Blue Gem Patterns Guide

An in-depth pattern guide and tier list for the knives Case Hardened Blue Gem pattern CS2

Blue Gem Patterns

Blue Gem is the name for Case Hardened skins with the maximum amount of blue on them.

In CS2 there are 20 different knives, AK-47, Five-SeveN and MAC-10 with Case Hardened pattern. All of them are very popular, although each weapon has its own hits.

Some skins in CS2 won’t look differently with various Pattern Indexes. But with Case Hardened, it’s the opposite. Patterns decide everything and the price can jump ten times depending on the number. The most expensive skins in this series are almost entirely blue, they’re called Blue Gems.

These skins are considered very rare and super valuable among traders and players. The most famous Blue Gem skin is AK-47 Case Hardened with Pattern Index #661.



There are four different tiers in the index, numbered 1-4 in order of value, with 1 being the highest and 4 lowest.

Tier 1 patterns have the highest amount of the Blue stain from the Case Hardened finish, and thus generate the highest amounts of overpay for the skin, sometimes several times over the average market value, due to their rarity and demand. The amount of the blue stain gradually decreases as you go down the tiers, and the least amount is present on patterns from Tier 4, which are equivalent in value to the average market value at which the skin sells for.

Case Hardened Patterns

Case hardened skins have lots of unique patterns. Certain patterns with more of the light blue color are valued higher by the community. These skins are referred to as "Blue Gems". The patterns are completely random for every seed so there is no easy way to sort them to find the ones with the most blue.

Texture Masking

In the Case Hardened texture, you can see the light blue areas on the left, and top left. There are also a few smaller areas scattered around the texture.

In order to get an accurate representation of the amount of blue applied to a specific weapon model, a color mask is applied over the top of the blue areas. We can then detect that specific color mask when reading the model and calculate the percent of blue visible on the model.



It’s a square texture that is applied to the weapon model randomly. The texture’s location is determined by a number from 1 to 1000. These numbers are called Pattern Index.

Other Blue Gem Skins

AK-47 Blue Gem

All other patterns, except for #661, are divided into three tiers by the amount of blue colour on the weapon finish. But at the same time, this blue is taken into account only on the central part of the gun’s case and the mag. Blue spots on the barrel’s end and the buttstock’s back do not affect the tier.
https://steamcommunity.com/sharedfiles/filedetails/?id=2941982575

Five-SeveN Blue Gem

Five-SeveN is similar to Case Hardened knives category-wise. They also have Colour Ratios calculated, and the cost is determined based on them. The most expensive, of course, are Blue Gem skins. Pattern numbers: #278, #690 and #868. As for the rest, the more blue, the higher the price tag.
https://steamcommunity.com/sharedfiles/filedetails/?id=2948645553

MAC-10 Blue Gem

The Tier 1 category of MAC-10 Blue Gem patterns, with seeds #667, #114, and #406 being considered the top three.
https://steamcommunity.com/sharedfiles/filedetails/?id=3087121918

Patterns Blue Gem Guide

Karambit Knife Blue Gem

In the world of Karambit Case Hardened Blue Gems, the 387 pattern reigns supreme as the highest-ranked one. Its play side is adorned in a mesmerizing shade of blue, captivating any beholder. These sought-after Blue Gem patterns command a price significantly higher than their market value due to their rarity and exceptional quality.
https://steamcommunity.com/sharedfiles/filedetails/?id=2948564018

M9 Bayonet Knife Blue Gem

The #1 Blue Gem in this list pattern 601 is almost entirely covered in blue.
https://steamcommunity.com/sharedfiles/filedetails/?id=2948578790

Butterfly Knife Blue Gem

The #1 pattern 182 Blue Gem is almost totally covered in blue, the amount of blue on the Butterfly Case Hardened steadily diminishes as you move down the table.
https://steamcommunity.com/sharedfiles/filedetails/?id=3087097250

Skeleton Knife Blue Gem

The best and the most expensive ones are easily its top two Blue Gem patterns, coming with seeds #403 and #456, which can also be counted among the best-looking Blue Gems in CS2.
https://steamcommunity.com/sharedfiles/filedetails/?id=3087138888

Talon Knife Blue Gem

The top two Blue Gem patterns are seeds #55 and #923
https://steamcommunity.com/sharedfiles/filedetails/?id=3089709897

Bayonet Knife Blue Gem

The #1 pattern for Bayonet Case Hardened is considered to be 555. Another pattern that closely resembles the #1 pattern is the pattern 592.
https://steamcommunity.com/sharedfiles/filedetails/?id=3087156204

Flip Knife Blue Gem

The Blue Gem Case Hardened pattern as well, of which seeds #670 and #321 are the top two options.
https://steamcommunity.com/sharedfiles/filedetails/?id=3088588867

Kukri Knife Blue Gem

The pattern index 494 is the best Blue Gem for a Talon Knife Case Hardened. Other notable high-tier patterns include the pattern indexes 575, 770
https://steamcommunity.com/sharedfiles/filedetails/?id=3229119705

Stiletto Knife Blue Gem

There are only three Tier 1 Blue Gem seed patterns for the Stiletto, and starting from the best seed, these are #182, #713, and #494.
https://steamcommunity.com/sharedfiles/filedetails/?id=3089691516

Patterns Blue Gem Guide

Survival Knife Blue Gem

The top Blue Gem seed patterns for the Survival Knife are #403 and #456.
https://steamcommunity.com/sharedfiles/filedetails/?id=3089705604

Ursus Knife Blue Gem

The Ursus Knife’s top Blue Gem seed is #494
https://steamcommunity.com/sharedfiles/filedetails/?id=3090046949

Nomad Knife Blue Gem

One of the best ones to get for this knife would be the Case Hardened finish in any of its Nomad Knife Blue Gem pattern seeds, with #456, #577, and #169 being the top three.
https://steamcommunity.com/sharedfiles/filedetails/?id=3089706915

Paracord Knife Blue Gem

For the Paracord Knife the best patterns are considered to be the pattern indexes 403 and 316.
https://steamcommunity.com/sharedfiles/filedetails/?id=3089711147

Huntsman Knife Blue Gem

The #1 pattern for Huntsman Knife Case Hardened is considered to be 618. Another pattern that closely resembles the #1 pattern is the pattern 652, the difference being, the 29 pattern has a gold tip instead of blue.
https://steamcommunity.com/sharedfiles/filedetails/?id=3234614725

Bowie Knife Blue Gem

The #1 pattern for Bowie Knife Case Hardened is considered to be 182. Another pattern that closely resembles the #1 pattern is the pattern 398.
https://steamcommunity.com/sharedfiles/filedetails/?id=3234415580

Falchion Knife Blue Gem

The #1 pattern for Falchion Knife Case Hardened is considered to be 494. Another pattern that closely resembles the #1 pattern is the pattern 838, the difference being, the 383 pattern has a gold tip instead of blue.
https://steamcommunity.com/sharedfiles/filedetails/?id=3233766815

Gut Knife Knife Blue Gem

As can be seen, the pattern index 567 is the best Blue Gem finish for the Shadow Daggers Case Hardened. Other notable high-tier finishes include the pattern indexes 125 and 962.
https://steamcommunity.com/sharedfiles/filedetails/?id=3234526881

Shadow Daggers Blue Gem

As can be seen, the pattern index 56 is the best Blue Gem finish for the Shadow Daggers Case Hardened. Other notable high-tier finishes include the pattern indexes 505 and 417.
https://steamcommunity.com/sharedfiles/filedetails/?id=3234477590

Navaja Knife Blue Gem

The #1 pattern for Navaja Knife Case Hardened is considered to be 398. Another pattern that closely resembles the #1 pattern is the pattern 407, the difference being, the 838 pattern has a gold tip instead of blue.
https://steamcommunity.com/sharedfiles/filedetails/?id=3234656579

[saul]

is pattern 641 bayonet (t4) worth extra overpay for being double sided? I have one

[𝙈𝙖𝙩𝙩.]

Is the Flachion Knife pattern 351 considered a blue gem? If not, why?

[• 𝖋𝖆𝖙𝖍𝖊𝖗Ø.]

Survival knife case hardened #681 is tier 1 p2

[korenevskiy]

thank you, I'm not interested in buying or trading right now

[• 𝖋𝖆𝖙𝖍𝖊𝖗Ø.]

And good price.

[• 𝖋𝖆𝖙𝖍𝖊𝖗Ø.]

I got classic 668 If You interesing.

[korenevskiy]

I may release the rest of the Blue Gem guides.

[DR3AM2]

Hi. Can u make a classic Knife guide?

[• 𝖋𝖆𝖙𝖍𝖊𝖗Ø.]

Yea tier 2 can be.

[korenevskiy]

• 𝖋𝖆𝖙𝖍𝖊𝖗Ø. ⇄, talon pattern #873 is not tier 1, pattern #873 tier 2