What is the most expensive AWP skin in CSGO?

Can you please tell me, what is considered to be the most costly AWP skin in the popular first-person shooter game, Counter-Strike: Global Offensive (CSGO)? I'm interested in knowing which specific skin commands the highest price among players and collectors alike, and if there's any particular reason why it's so highly valued. Additionally, are there any notable recent changes or trends in the pricing of AWP skins that you could share?