Hatton Garden is famous as London's jewellery quarter and the centre of diamond trade in the United Kingdom. This specialisation grew up in the early 19th century, spreading out from its more ancient centre in nearby Clerkenwell. Today there are nearly 300 businesses here in the jewellery industry and over 55 shops, representing the largest cluster of jewellery retailers in the UK. The largest of these businesses was De Beers, the international family of companies which dominated the international diamond trade. Their headquarters were in an office and warehouse complex just behind the main Hatton Garden shopping street.