Harry Winston Diamond Gold Cufflinks. Onyx 18K white gold diamond cufflinks by Harry Winston. Known as one of the world's most prestigious jewelry companies, his name is linked to most beautiful jewels, settings, and to luxury and exclusivity. Harry Winston, luxury brand jewelry is among the most noted company in the world, well-known to the general public for extraordinary designs. Approximate Measurements: Length: 1" Diameter: 0.6 Weight: 20.4 Grams.