The ring features a diamond with a total weight of approximately 0.87 carats, with a color grade ranging from H to J and a clarity grade ranging from VS to SI.

The term "Tremble Center" typically refers to a design in which the central diamond is mounted on a spring, allowing it to move and "tremble" slightly as the wearer moves. This was a popular style in the mid-20th century.

As a vintage piece, the ring may have unique design elements and craftsmanship that make it a valuable and desirable piece of jewelry.