Which diamond cut is most expensive?

I'm curious to know, which diamond cut is considered the most expensive among all the various styles? Is it the classic round brilliant, known for its brilliance and sparkle, or perhaps a more intricate and rare cut like the heart-shaped or the princess cut? Each cut seems to have its own unique characteristics and appeal, but which one carries the highest price tag? It would be fascinating to understand the factors that contribute to the cost of different diamond cuts and why some are more sought-after and valuable than others.