The era’s jewelry reflects a freedom from the romance (and diamond garlands) of the Belle Epoque. It was a liberation that has proved highly desirable; signed Art Deco pieces remain some of the ...

The piece—of natural pearl, tourmaline, ruby, onyx, and diamonds—was part of the collection of tastemaker Mica Ertegun, which is a partial explanation. But for jewelry experts the key to the high bid ...