New money; wealthy persons whose fortunes are newly acquired, and who are therefore perceived to lack the refinement of those who were raised wealthy.
Newly rich; like a nouveau riche.
A person who has risen, climbed up, or has been promoted to a higher social class, especially through acquisition of wealth, privileges, or political authority but has not gained social acceptance by those within that new class.
Being a parvenu; also, like, having the characteristics of, or associated with a parvenu.