Featured in Joe’s Special Box – Volume 170 by Joden Girl, this vintage brooch is a striking example of conversion jewelry. Crafted in 18-karat white gold, the design is composed of three adjoining squares, each cut diagonally to create a bold contrast. One half features a polished triangle of black onyx, while the other is adorned with fine engraved lines that catch the light. Atop each onyx wedge rests a bezel-set round diamond, adding just the right amount of sparkle. The three diamonds have a combined weight of approximately 0.25 carat. Measuring just over an inch in length, this unique piece blends Art Deco-inspired geometry with timeless elegance.