This beautiful brooch pendant is a stunning piece of jewelry, featuring 29 carats of mixed-cut diamonds set in platinum. 

The design is elegant and dynamic, with a swirling, asymmetrical form that gives it a sense of movement. The central structure is a circular motif, densely encrusted with small, round brilliant-cut diamonds that create a sparkling, pavé-like surface. This circular section is framed by elongated, baguette-cut diamonds, which add a sleek, linear contrast to the round stones, enhancing the piece's geometric appeal.

At the top of the brooch, there’s a prominent cluster of larger diamonds, including a mix of cuts such as rectangular step-cut stones. These larger diamonds are set in a way that makes them stand out, drawing the eye with their clarity and brilliance. The use of mixed cuts adds depth and visual interest, as the different facets reflect light in unique ways.

One of the most striking features is the cascading fringe that extends from the lower part of the brooch. This section consists of several elongated elements, each set with baguette-cut diamonds that form a linear pattern. These elements are tipped with larger, kite-shaped or triangular diamonds, which dangle slightly, adding a sense of fluidity and motion to the piece. The fringe design gives the brooch a dramatic flair, making it ideal for formal or evening wear.

The entire piece is crafted in platinum, a metal known for its durability and cool, silvery-white tone, which complements the icy brilliance of the diamonds perfectly. The combination of the platinum setting and the 29 carats of diamonds creates a luxurious, high-impact piece that exudes sophistication and timeless elegance.

This brooch pendant dates to a period where such bold, diamond-heavy designs were popular, possibly mid-20th century, reminiscent of Art Deco or Retro-era jewelry. It’s a versatile accessory that could be worn as a brooch on a lapel or as a pendant on a chain, making it a statement piece for any jewelry collection.