A pear of blue sapphire, held in four prongs.A six-by-eight-millimetre pear-shaped blue sapphire at the centre, hand-selected for saturation, with point-three carats of round-brilliant diamond along the shoulders. Set in fourteen-karat white gold or platinum, finished to a single polished line.Heirlooms in the making.

Garnet, set with two diamonds on either side.A six-by-six-millimetre square garnet at the centre, hand-selected at the source for the deep red saturation. Two round-brilliant diamonds run along each shoulder — point-zero-two carats in total — in fourteen-karat yellow gold, the band finished flush...

Garnet, framed in a halo of diamond.A seven-by-seven-millimetre garnet at the centre, hand-selected at the source for colour, surrounded by point-two-three carats of round-brilliant diamond in fourteen-karat white gold. The halo holds the stone forward; the band closes flush beneath the cup setting.The best...

Garnet, set in fourteen-karat white gold.An eight-by-eight-millimetre garnet at the centre, hand-selected at the source for the deep red saturation, paired with point-one carats of round-brilliant diamond at the shoulders. Set in fourteen-karat white gold, shaped and finished in the New York atelier; the...

Citrine, flanked by diamond.An oval citrine at the centre, hand-selected for the warm honey saturation, set with twelve round-brilliant diamonds along each shoulder in fourteen-karat gold. The stone carries the colour; the diamonds carry the line.The best jewels make the best gifts.

Blue topaz, set in fourteen-karat white gold.An eight-by-ten-millimetre Swiss blue topaz at the centre, flanked by six round-brilliant diamonds — six-hundredths of a carat — in fourteen-karat white gold. The stone runs cool against the metal; the diamonds finish the shoulder.The best jewels make...

Blue topaz, ringed in diamond.A seven-by-ten-millimetre fancy-cut blue topaz at the centre, hand-selected at the source for clarity. Thirty-four round-brilliant diamonds — point-two-three carats — frame the stone in fourteen-karat white gold, the halo running cleanly around the cut.The best jewels make the best...

The solitaire, in blue topaz.A seven-by-nine-millimetre blue topaz at the centre, hand-selected at the source for clarity and the cool blue saturation of the cut. Set in fourteen-karat white gold, the band finished to a single polished line around the stone — the bezel...

Onyx, set with diamond accent.An eight-by-eight-millimetre black onyx at the centre, hand-selected for an even matte field with no banding. Point-one carats of round-brilliant diamond run along the shoulders in fourteen-karat white gold, the band finished flush around the stone.The best jewels make the...

Amethyst, ringed in diamond, framed in rope.A nine-millimetre amethyst at the centre, hand-selected for the deep violet saturation, with point-one-eight carats of round-brilliant diamond as a halo. Set in fourteen-karat white gold with a rope-cut detail around the shoulder.The best jewels make the best...