When it comes to Karambit Case Hardened, the most valuable patterns are the ones with the highest amount of blue on the blade. These are called "blue gems," and collectors will pay a premium for them. The pattern index determines how much blue appears on the knife, and some indexes are far rarer than others. Even partial blue patterns can be worth more than regular ones. If you're buying one, make sure to check the float value as well, since lower floats generally look better. If you want to explore different patterns and their prices, visit this site https://dmarket.com/csgo-skins/product-card/karambit-case-hardened . Investing in a good pattern can be worth it if you plan to trade or resell later.