The Case Hardened finish on this balisong comes from a genuine metallurgical process: packing the steel in wood charcoal and baking it at high heat, which leaves a swirl of blue, gold and gray oxide tones across the blade. Because the coloring is driven by the metal itself rather than a printed pattern, no two pieces tile the same way, and the rare deep-blue-heavy plays are what collectors chase. It is a Covert butterfly knife, so the open-and-close show comes attached to a one-of-a-kind blued surface.
Butterfly Knife (Case Hardened): design, wear and market
Case Hardened pattern & Blue Gem
Case Hardened skins are tinted by a paint seed, one of 1000 patterns. The seed fixes the blue, gold and purple layout on the weapon, so two Case Hardened of the same wear can look completely different and trade at very different prices.
Seeds with heavy blue coverage on the most visible side are called "Blue Gems". On the AK-47 the best-known examples are seeds like 661, 670 and 955; on the Karambit, seed 387 is the reference Blue Gem. Tier lists rank seeds by blue percentage, and top patterns command large premiums over an average Case Hardened.
Because the seed is not shown in the item name, buyers check the paint seed in the inspect screen or a pattern database before paying a Blue Gem price.
Across 30 markets the BS floor moved +2.1% in 19 days: $615.00 → $627.96.
Sources: Valve item data · our 30-market price snapshot.
How much does Butterfly Knife (Case Hardened) cost?
The current floor for Butterfly Knife (Case Hardened) is $627.96, compared across 30 marketplaces with fees included. By wear: FN $1,214.58 · MW $864.08 · FT $692.41 · WW $569.95 · BS $627.96.
Where can I sell or cash out Butterfly Knife (Case Hardened)?
The best net payout right now is $593.88 on DMarket after its seller fee — the Sell tab ranks every venue. Steam pays $1,578.00 into your wallet, but Steam funds cannot be withdrawn as real money.
Does Butterfly Knife (Case Hardened) come in StatTrak or Souvenir?
Yes — this skin also trades as StatTrak (from $800.71). Use the Quality pills above to switch; every number on the page recalculates for the selected variant.
How do I get Butterfly Knife (Case Hardened)?
It drops from Operation Breakout Weapon Case (the container itself trades from $6.90), or you can buy it directly from $627.96 on the marketplaces above — buying a specific skin is almost always cheaper than opening containers for it.
Operation Breakout Weapon Case
Inspect a BS copy in game 
