Coloured Diamonds and Gemstones

Diamond Brothers purchases fancy coloured diamonds in yellow, pink, blue, green, brown, grey and black grades, alongside coloured gemstones including sapphires, rubies, emeralds, tanzanites, alexandrites, paraibas, spinels and aquamarines. Both loose stones and gemstones set in jewellery are accepted by certified gemologists.

Fancy coloured diamonds are valued primarily on colour intensity and saturation rather than the absence of colour. The GIA grading scale (Faint, Very Light, Light, Fancy Light, Fancy, Fancy Intense, Fancy Vivid, Fancy Deep, Fancy Dark) determines the valuation tier, with rarer colours such as pink, blue and red commanding premium prices.

Yes. Origin is a primary value factor for coloured gemstones. Kashmir sapphires, Burmese rubies and Colombian emeralds command significant premiums over equivalent stones from other sources. Origin certification from laboratories such as Gübelin, SSEF, GRS or AGL strengthens the valuation by confirming geographic provenance.

Yes. Heated, treated and enhanced gemstones are accepted by Diamond Brothers, though untreated stones typically command higher valuations. Certified gemologists in Antwerp identify common treatments such as heat treatment, fracture filling, beryllium diffusion and oiling. Treatment disclosure is essential, and laboratory reports confirming treatment status support the final offer.

Your fancy coloured diamond's value depends primarily on colour intensity and saturation, with the GIA grading scale (Faint through Fancy Vivid) determining the valuation tier. Carat weight, clarity and cut also contribute. Diamond Brothers' certified gemologists evaluate each coloured diamond in Antwerp, with GIA certification supporting the strongest valuations on the European resale market.