This element:

-has electrons in d sublevel

-is the heaviest named element in its group

-is a shiny metal used for jewelry

does anyone know which element it is?

If it was in group 11 where both silver and gold is found, with copper as well, then the answer would be gold. It does have a d-orbital shell in its electron configuration and it is the heaviest in its group. It is common knowledge that it is used as a shiny metal for jewelry, which we can see on accessories nowadays.