Quality and value factors

C-1 = colour

The colour, saturation and tone determine the quality of precious gemstones. Exceptional Tanzanite for example, displays an intense violetish blue with red flashes. Diamonds on the other hand, are valued for their absence of colour. At van Hilten & Co. only the highest colour qualities make it into our collection.

C-2 = clarity

The imperfections and inclusions on precious gemstones impact its quality. The highest quality gemstones stones are hand-picked and expertly cut to ensure brilliance and luminescence.

C-3 = Cut

The cut of a precious gemstone is extremely important, as it determines the brilliance, radiance and scintillation of the stone. At van Hilten & co. expert cutters and craftsmen carefully study each rough stone to ensure the perfect orientation and ideal shape.

C-4 = Carat

All precious gemstones are sold by their weight. At van Hilten & co. we have an exceptional and rare collection of precious gemstones, including investment stones.