It is not a formula
Unlike Fade, Blue Gem quality can't be computed. Case Hardened splashes blue, purple and gold differently for every paint seed, and the community ranks each seed by how much blue lands on the play side — the face you see in game.
COMMUNITY TIER DATA · 23 WEAPONS · 3,000+ SEEDS
CS2 Blue Gem Patterns — Case Hardened Tier Lists by Seed
Browse the community Blue Gem tier lists for Case Hardened skins across 23 weapons and 3,000+ catalogued seeds — the top blue seeds for the AK-47, Karambit, M9 Bayonet, Five-SeveN and more. Check any paint seed against the tiers before you buy.
#661
AK-47 · top blue gem
The "Scar" — a near-fully blue play side and the single most sought-after Case Hardened pattern in the game.
Tier 1Highest blue coverage — the grails7 seeds
#661#151#955#321#387#670#179
Tier 2Strong blue with some gold/purple6 seeds
#592#4#905#13#168#429
Tier 3Notable blue, lower coverage51 seeds
Show all 51 seeds
#555#442#978#139#828#969#750#695#103#112#733#844#228#868#434#698#74#996#760#375#708#823#690#791#278#917#463#711#849#92#82#450#512#310#713#11#721#236#172#950#147#782#322#363#189#961#497#430#887#426#862
Tier 4Some blue — for completeness82 seeds
Show all 82 seeds
#770#648#28#575#73#798#557#627#532#541#935#453#479#872#522#525#664#622#494#344#965#775#847#209#689#306#803#169#577#381#878#2#888#526#879#126#605#468#269#891#481#985#715#248#456#420#681#32#397#493#788#256#470#418#927#182#178#685#407#507#65#200#694#922#795#809#296#842#194#431#341#447#130#205#428#230#458#1000#242#34#325#724
Check a paint seed
on AK-47
Type a paint seed to see if it is a listed Blue Gem on this weapon.
How Blue Gem grading works
Seeds are weapon-specific
The same seed looks completely different on an AK-47 versus a Karambit. Every weapon has its own tier list, so #661 is the AK grail but means nothing on another knife. Always check the tier for the exact weapon.
Verify before you pay
A Blue Gem premium can be many times the base skin. Screenshots exaggerate blue and the back of the weapon may be plain — always confirm the seed through an inspect link and cross-check the tier here before buying.
Blue Gem FAQ
What is the best AK-47 Blue Gem seed?
Seed 661 — "The Scar" — is the undisputed #1, with a near-fully blue play side. Top examples have sold well into six and seven figures. It sits in a tier of its own above the rest of Tier 1.
Is a Blue Gem worth more than a normal Case Hardened?
Dramatically more when the seed is genuinely blue. High blue coverage on the play side can multiply a skin's value many times over, while a mixed or gold-heavy seed of the same skin carries no premium at all. The seed number is everything.
How do I check a Case Hardened seed?
Open the item's in-game inspect link to read its paint seed, then look it up here for that exact weapon. Never trust a seller's screenshot alone — lighting and angle exaggerate the blue and the hidden side may be plain.
Are these tiers official?
No — Blue Gem tiers are community-curated, compiled from public pattern guides and trader consensus. They reflect blue coverage and demand, not a Valve ranking, and can shift as new sales set benchmarks.