If you want to wish upon this star, it’ll cost millions.

A 39-carat, pear-shaped diamond — whose owner dubbed it “The Evening Star” — is going on the auction block in Midtown next month.

The fabulous rock, which will be auctioned at Christie’s on Dec. 10, is expected to fetch $3.6 million to $5.5 million.

It comes from the famed Golconda mines in India that also yielded the celebrated Hope and Wittelsbach diamonds.

The unidentified owner called the diamond — about the size and shape of the bowl of a teaspoon — “The Evening Star” because she wore it to evening galas.

It can be worn suspended from a diamond necklace that will be offered as a separate item in the sale.