R. Stone black chalcedony, diamond and rock crystal necklace-bracelet combination, property of a private Sydney collector, modelled as a line of spherical openwork black chalcedony links alternating between annular rock crystal links and 18ct gold and pave-set diamond connectors, the diamonds together weighing approximately 2.43 carats, necklace length 560 mm, bracelet length 190 mm, (May be joined and worn as a longer necklace), marker's mark, signed R. Stone. (2)