The diamonds were manufactured by Koninklijke Tichelaar, the oldest ceramics manufacturer in the Netherlands and an expert in creating specialist glazes. In addition to the colours that make up the gradient on the façade, the diamonds are finished with an iridescent sheen, achieving a soft, dynamic finish that changes according to the lighting, weather, and viewing angle. This glaze was developed by Tichelaar in collaboration with MVRDV, and uses intentional variations in mineral composition and glazing temperature across the diamond surface to create a subtle, naturalistic sheen. The effect is a reference to Favrile glass, a sumptuously coloured, iridescent glass which was developed and patented by Louis Comfort Tiffany in the 1890s.