BM 33599
Diamond "carbonado" from Brazil.
Specimen registered as "Carbonado", it is a dark-brown rounded octahedron, approx 15mm across, with a cubic termination at one end.
A highly carbon rich diamond, or pseudomorph, it is a historical piece from the Museum collections, 1861

Anyone with information concerning the whereabouts of this specimen should contact:

Mr. Alan Hart
Curator of Collections
Mineralogy Department
The Natural History Museum
Cromwell Road
London SW7 5BD