Reference for the rarest CS2 patterns — Blue Gem #661 on AK-47 Case Hardened, Fire and Ice on Marble Fade, Emerald phases on Doppler. Pattern indices, tier rankings, price multipliers.
Every CS2 skin instance has a pattern index — a number between 0 and 1000 — that controls how the procedural texture is applied to the model. Two AK-47 Case Hardened skins with the same float can look completely different because their pattern indices map to different blue-vs-gold distributions. The pattern index is locked at the moment of unbox and cannot be changed.
Pattern lottery is the most speculative high-upside system in CS2 collecting. Where float value is on a continuous 0.00-1.00 scale, pattern index produces discrete outcomes — most "lucky patterns" trade at 5×, 20×, even 100× the base finish price. AK-47 Case Hardened #661 trades 100× a base Case Hardened with the same float. Karambit Marble Fade Fire and Ice trades 8-15× base Marble Fade.
The community maintains pattern-index reference databases for each procedurally-generated finish. CSFloat and FloatDB show the pattern index of any inspected item; community tier lists rank specific indices by visual rarity. For Case Hardened, the question is "how much blue covers the playside." For Marble Fade, "how cleanly the red and blue separate." For Fade, "what percentage of the visible surface is gradient." For Doppler, "which phase rolled."
Rare-pattern variants are illiquid assets — the buyer pool for AK-47 Blue Gem #661 is under 50 people globally. Holding times can be 6-24 months between motivated buyers. The rewards are extreme: the legendary AK #661 has appreciated 400% in five years. But traders should size positions appropriately and have realistic time horizons.