Cologne Watch Diamond is a luxury retailer specializing in fine jewelry and designer handbags, with a strong focus on authenticated pre-owned pieces. Its collection includes gold and diamond jewelry, alongside creations from brands such as Cartier, Tiffany & Co., Bvlgari, Chopard, Piaget, and Wempe. Shoppers can browse rings, bracelets, bangles, necklaces, earrings, pendants, and brooches, as well as new arrivals and selected jewelry collections.

The handbag range features sought-after designs from Hermès, Chanel, and Louis Vuitton, including Birkin and Kelly styles. Cologne Watch Diamond also offers services for customers wishing to sell jewelry, Hermès handbags, or gold, as well as jewelry repair and restoration. The company highlights its expertise and product-authentication process, stating that its experts check items for authenticity. Online customers can shop through the website and benefit from insured shipping within Germany and the European Union, along with free returns. Cologne Watch Diamond presents itself as an independent retailer and notes that it is not affiliated with or associated with the brands whose products it sells.