The most expensive individual Lego ever auctioned was a 14-karat gold brick, which sold in a January 2017 Catawiki auction for $19,793. Since they’re incredibly rare, gold bricks might be the most valuable Lego, but they’re not indicative of the value of commercially-sold Lego.
Can you buy Legos by color?
You can buy sets (current or retired), minifigures, and individual bricks of all types and colors. The way it works is very similar to eBay, except that there is no bidding.