http://www.legislation.gov.uk/id/uksi/2001/1004

SCHEDULE 3PAYMENTS TO BE DISREGARDED IN THE CALCULATION OF EARNINGS FOR THE PURPOSES OF EARNINGS-RELATED CONTRIBUTIONS

PART IVPAYMENTS BY WAY OF SPECIFIC ASSETS NOT DISREGARDED AS PAYMENTS IN KIND

Gemstones

10.

Any gemstone, including stones such as diamond, emerald, ruby, sapphire, amethyst, jade, opal or topaz and organic gemstones such as amber or pearl, whether cut or uncut and whether or not having an industrial use.