AK-47 · Case Hardened

AK-47 | Case Hardened — Blue Gem Patterns

Community term: Blue Gem

AK-47 | Case Hardened

What is Blue Gem?

Case Hardened uses a procedurally generated metallurgical-character finish where pattern indices 0-1000 produce wildly different distributions of blue vs gold colour across the AK-47 receiver. The most coveted patterns produce near-fully-blue top, magazine, and stock with minimal gold contamination. These are called "Blue Gems".

Blue Gem patterns trade 50× to 1000× the base Case Hardened price.

Top patterns ranked

#1
661
#661 — Holy Grail
The most legendary AK pattern. Near-100% blue receiver, magazine, and back. Multiple sales above $200K documented. FN copies are six-figure trades.
Tier1
#2
670
#670
Tier-1 Blue Gem. ~95% blue top with clean magazine and minimal gold. Trades $80K-$120K range FN.
Tier1
#3
387
#387
Tier-1 Blue Gem. Strong blue magazine and top with crisp gold accent. $50K-$80K FN range.
Tier1
#4
168
#168
Tier-2 Blue Gem. Strong top + magazine blue with side gold visible. $25K-$40K FN range.
Tier2
#5
179
#179
Tier-2 Blue Gem. Heavy blue top with some gold blend. $20K-$35K FN range.
Tier2
#6
760
#760
Tier-2 Blue Gem. Blue magazine but mixed top. $15K-$25K FN range.
Tier2
#7
555
#555
Tier-3 Blue Gem. Moderate blue receiver, recognizable to enthusiasts. $8K-$15K FN range.
Tier3
#8
928
#928
Tier-3 Blue Gem. Sub-tier-2 but distinct from base patterns. $5K-$10K FN range.
Tier3

Other rare patterns

Karambit | Marble Fade — Fire and Ice Patterns
True Fire and Ice patterns trade 8× to 40× base…
AWP | Fade — 100% Fade Patterns
100% Fade patterns trade 2× to 5× base FN Fade …
Glock-18 | Fade — 100% Fade Patterns
100% Fade Glocks trade 4× to 8× base FN Fade pr…
Karambit | Doppler — Emerald Phase
Emerald phase Karambits trade 8× to 20× standar…