The CS2 skin Ruby first appeared in the game in 2018. It is a vibrant pink and red color pattern with a diamond-like texture. This skin is most commonly found on the AK-47, M4A4, and M4A1-S rifles. However, it can also be found on some knives, such as the Karambit, Flip Knife, Gut Knife, and Bowie Knife.
The rarity of this skin in the game is classified as “rare”. This means that it is not as common as other skins, and is more difficult to obtain. It is also considered to be one of the more expensive skins in the game.