Check the listing for details. vintage silberson markasit schwarzer onyz brooche. Condition: Pre-owned. Listed at 18.00 USD. The product is a vintage Silberson Markasit Schwarzer Onyx brooch, a stylish and unique accessory that adds a touch of elegance to any outfit. This brooch features a classic design with a black onyx stone set in a silvertone setting, making it a versatile piece that can be worn on a lapel, collar, or even as a statement pin on a bag or accessory. Its vintage charm adds a timeless quality to any look, making it a must-have for those who appreciate classic fashion.