In his 32-carat apricot-color diamond ring, the stone is held in place by threads tied on either side in delicate diamond-shape knots.

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The distinctive diamond-shape cabinets provide high rigidity for tight and deep bass reproduction, and cater for a very wide sweet-spot, filling even large rooms with music from these impressive compact speakers.

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He runs advanced composite materials, which makes a kind of artificial diamond used to cut and shape jet engine parts.

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The 18k white gold and diamond clip on the cap is in the shape of the knife used in the film, Psycho.

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Christie's specialist, Jean Marc Lunel, said the Archduke Joseph is prized because it boasts the highest quality of shape, colour and clarity that can be found in a diamond.

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Built by connecting a number of standard modules each measuring 384mm both in height and width and weighing eight kilograms, the Diamond Vision OLED is scalable and can be designed to flexibly form a certain size or shape, even against rounded surfaces.

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The shape of the stone, likely dating back to the later 16th century, is a product of "diamond-cutting in its infancy, " he says.

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