CS2 rare patterns: blue gem, Fade % and Marble Fade

Rare patterns in CS2 are specific versions of a finish that look noticeably different from the usual ones, such as a Case Hardened covered in blue, a Fade with an almost full gradient, or a Marble Fade with a striking colour split. They exist because many finishes are painted using a pattern index (often called the seed) between 0 and 1000, and some of those indexes produce looks collectors chase. Here is how the main ones work and what to know before you go hunting.

How patterns work

When a skin is generated, it receives two hidden values: a float, which controls wear, and a pattern index from 0 to 1000, which controls how the texture is placed on the weapon. On simple finishes the pattern barely matters. On finishes like Case Hardened, Fade, Marble Fade, Doppler or Crimson Web, it changes the look so much that two copies of the same skin with the same wear can be valued very differently by collectors.

The pattern index is fixed for the life of the item. You can inspect it in game or with community inspect tools, and collectors keep lists of which indexes are considered best for each weapon.

Case Hardened and the blue gem

Case Hardened finishes mix blue, gold and purple tones on a metal base. Most copies show a mix; a small number show large areas of clean blue, especially on the most visible side of the weapon. Those are called blue gems.

• The best known is seed 661 on the AK-47 Case Hardened, widely considered the most famous blue gem in the game.
• Each weapon has its own good seeds. A great seed on one weapon may be ordinary on another, because the texture is mapped differently.
• Collectors also look at the “playside” (the side you see in your hands) versus the back, and at gold-heavy patterns, which have their own fans.

Case Hardened knives such as the Karambit Case Hardened follow the same logic with their own seed lists. The Five-SeveN Case Hardened is a common entry point to the finish.

Fade and the Fade percentage

Fade is a gradient running from yellow through pink to purple. Depending on the pattern index, the gradient covers the visible part of the weapon more or less completely. The community expresses this as a Fade percentage: the higher the number, the more of the visible surface shows the pink and yellow end of the gradient rather than purple.

Fade appears on knives like the Karambit Fade and on guns like the Glock-18 Fade. Different tools can calculate the percentage slightly differently, so compare like with like.

Marble Fade: Fire & Ice, Tricolor and more

Marble Fade mixes red, blue and yellow swirls on knives. Collectors give names to the most sought-after looks:

• Fire & Ice: the tip and blade show only red and blue, with no yellow. Usually considered the top Marble Fade pattern.
• Fake Fire & Ice: mostly red and blue, but with a little yellow or another colour creeping in.
• Tricolor: clear separate bands of red, yellow and blue.
• Red tip or blue tip: a tip dominated by one colour.

Which knife and which index produce these looks is documented by the community for each knife model. Examples in the catalogue include the Karambit Marble Fade and the Bayonet and M9 Bayonet versions.

Doppler: a related but different case

Doppler and Gamma Doppler also depend on the pattern, but they are grouped into named phases (Phase 1–4, Ruby, Sapphire, Black Pearl and Emerald for Gamma Doppler). Phases are tracked as separate items. Within a phase, collectors still compare patterns, but the phase itself is the main factor. See our guide to Doppler phases.

What this means at SoleBCN

To be clear about what you get here: on SoleBCN you choose the skin, the wear and, where it exists, the StatTrak™ or Souvenir version and the Doppler phase. You can't choose a pattern index or a float. Each order delivers a unit of the wear you picked with a random float and a random pattern within that wear. We don't sell specific patterns, blue gems or Fade percentages, and our prices are for regular copies, not hand-picked ones.

That makes the store a good fit if you like the look of a finish in general and want a fair price for a normal copy. If you are hunting a specific seed, you'll need to inspect individual items wherever they are listed.

Tips if you are interested in rare patterns

1. Learn the seed lists for the exact weapon you want; they are not shared between weapons.
2. Always inspect the actual item yourself rather than trusting a screenshot.
3. Check the playside, because that is the part you see in game.
4. Be aware that rare patterns are illiquid: values are subjective and buyers are few.
5. Don't confuse wear with pattern; a low float doesn't make a pattern rare.