18ct two-tone gold, pearl, diamond and gem set necklace, centring an oval panel set with fluted rock crystal, collet-set with a brilliant-cut diamond at the centre, within a pave-set diamond border, to a diamond capped pearl torsade, accompanied by interchangeable carved panels of hematite and lapis lazuli, clasp measuring 40 mm x 29 mm, overall length 380 mm.