A two-colour diamond Cartier Tubogas collar necklace, modelled as a 'gas pipe' link collar, with central trapeze shaped panel pavé with round brilliant diamonds and two similarly set spacer bars, to a concealed box clasp and figure of eight catch. Signed Cartier, no.963381, 400mm long, 50.91g Condition Report: With a receipt from Bonhams dated 11/12/2002