Premium glass is utilizied on the back cover with a polarized glass pattern that offers a clean, modern look.

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To convince customers they were getting a better rock at a higher price, he developed a handheld, cylindrically shaped magnifying glass that clarifies the pattern of hearts and arrows.

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For both modes of crystal fibre, the pattern of holes is generated by stacking hollow glass tubes a millimetre or so in diameter to form a rod several centimetres thick.

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Even a well-equipped hacker can't get microscopic glass shards to fall into a prearranged pattern, says Ravikanth Pappu , a co-inventor of the technology.

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Each one is stuffed with several hundred tiny glass spheres or shards, of random size and glued in place in a random pattern so that each token, which can be inserted in a credit card, is unique.

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