Bonhams 1793 : A crystallized and red agate pendant necklace, Tom Scott for Andrew Grima,

the triangular-shaped pendant centering colorless crystallized agate within an irregular surround of banded red agate and accentuated by round brilliant-cut diamonds; suspended from a woven gold necklace; pendant signed Grima, with maker's mark TES for Tom Scott; necklace signed Grima; with London hallmarks; mounted in eighteen karat gold; length: 16 1/2in.

Sold for US$ 3,965 inc. premium