Gut Knife Case Hardened – Blue Gem Patterns and Seeds

Gut Knife Case Hardened is one of the more distinctive knives in CS2. Like other skins from this series, its appearance depends on the pattern seed, a number from 1 to 1000 that determines how the metallic texture is applied to the knife blade.

Most Gut Knife Case Hardened patterns contain a mix of gold, purple, and blue colors. However, a small number of seeds generate patterns with a large amount of intense blue color. In the CS2 community, such patterns are referred to as Blue Gems.

For knives, Blue Gems are especially important because the large blade surface makes the blue color very visible. The best seeds can be many times more expensive than regular Case Hardened patterns.

What Is a Blue Gem?

Every Gut Knife Case Hardened uses the same texture, but its placement changes depending on the seed.

Key facts:

the pattern seed ranges from 1 to 1000
only a small number of seeds generate patterns with dominant blue color
for the Gut Knife, the visible blade side (playside) is the most important
the larger the area of clean blue color on the blade, the higher the collector value

Blue Gem Seed Ranking

The trading community usually divides Case Hardened patterns into three quality tiers.

Tier 1 (T1) – the best Blue Gem patterns with the largest amount of blue color on the playside of the blade.
Tier 2 (T2) – seeds with a large amount of blue but with more visible gold and purple fragments.
Tier 3 (T3) – patterns with smaller blue elements that may still look visually attractive but are not considered top tier Blue Gems.

Out of the 1000 possible seeds, only a small portion generate patterns recognized as Blue Gems.

Key Seeds for Gut Knife Case Hardened

Based on pattern analysis and market data, several seeds stand out for having the highest blue coverage.

Tier 1 – Best Blue Gem Seeds

#647
Blue color: 58.0%

#567
Blue color: 55.9%

#962
Blue color: 54.4%

#60
Blue color: 53.1%

#125
Blue color: 52.0%

Tier 2 – Very Good Blue Gems

#974
Blue color: 63.8%

#799
Blue color: 62.5%

#215
Blue color: 62.0%

#724
Blue color: 60.5%

#920
Blue color: 60.4%

#218
Blue color: 59.7%

#165
Blue color: 59.9%

#928
Blue color: 58.1%

#870
Blue color: 58.0%

#591
Blue color: 57.1%

#9
Blue color: 56.5%

#662
Blue color: 56.1%

#977
Blue color: 53.7%

#384
Blue color: 51.1%

#997
Blue color: 51.1%

#171
Blue color: 50.3%

#140
Blue color: 50.2%

#232
Blue color: 48.7%

#644
Blue color: 47.2%

#723
Blue color: 47.2%

#939
Blue color: 47.2%

Tier 3 – Weaker Blue Gems (Examples)

#729
Blue color: 62.3%

#86
Blue color: 62.3%

#971
Blue color: 59.5%

#540
Blue color: 56.3%

#50
Blue color: 56.4%

#40
Blue color: 55.2%

#836
Blue color: 53.2%

#477
Blue color: 53.0%

#691
Blue color: 46.4%

#756
Blue color: 45.5%

#552
Blue color: 35.0%

The percentage of blue color across the entire blade is only one factor in determining Blue Gem quality. In practice, the placement of blue on the playside is equally important because this is the side visible during gameplay.

Table of Key Seeds

Tier	Seed	Blue color
T1	#647	58.0%
T1	#567	55.9%
T1	#962	54.4%
T1	#60	53.1%
T1	#125	52.0%
T2	#974	63.8%
T2	#799	62.5%
T2	#215	62.0%
T2	#724	60.5%
T2	#920	60.4%
T3	#729	62.3%
T3	#86	62.3%
T3	#971	59.5%

Blue Gem Statistics

Case Hardened skins have 1000 possible seeds
only a small portion generate Blue Gem patterns
most patterns contain large gold and purple areas
the price of the skin depends primarily on the pattern seed, and only then on the float

For Gut Knife Case Hardened, a good seed can significantly increase the value of the skin. Even a Field-Tested example with an attractive Blue Gem pattern can be far more valuable than a regular Factory New version of the skin.