Heaven will ultimately be the new Earth. And yes, the new Jerusalem is ornate. Because it's God's dwelling place.
Like that of a very precious jewel, like as jasper, clear as crystal” (
Revelation 21:11).
Are we going to have actual mansions in heaven or the new Earth?
The Greek word translated as mansion or house is
monai, a word referring to a dwelling place. The Father's "house" is a form of
oikos. It is the basic word for house in the Greek language. There is every indication that the believer's home will be good and even perfect, but there is nothing to indicate the exact nature of where believers will dwell. And none of this says anything about our material possessions on earth now.