Lot 518. Important pair of 6.03 carats and 7.11 carats Mogok Burmese ruby and diamond ear clips, M. Gérard. Estimate 480,000 — 760,000 CHF. Lot sold 578,500 CHF. Photo: Sotheby's 2012

Each centring on a cushion-shaped ruby weighing 6.03 carats and 7.11 carats respectively, within borders of brilliant-cut and pear-shaped diamonds, signed M. Gérard and numbered, French assay and maker's marks.

Accompanied by SSEF report no. 36998 and Gübelin report no. 12070171 and no. 12070172, stating that the rubies are of Burmese origin, with no indications of heating, with an additional note from Gübelin stating that the stones are likely to originate from the Mogok region.

Lot 516. Attractive 6.53 carats Mogok Burmese ruby and diamond necklace, M. Gérard. Estimate 265,000 — 450,000 CHF. Lot sold 362,500 CHF. Photo: Sotheby's 2012

The front set with an oval ruby weighing 6.53 carats, framed by brilliant-cut and pear-shaped diamonds, suspended from lines of gently graduated similarly cut stones, length approximately 365mm, signed M. Gérard and numbered, French assay and maker's marks, case signed M. Gérard.

Accompanied by SSEF report no. 64395 and Gübelin report no. 12080081, each stating that the ruby is of Burmese origin, with no indications of heating, together with an additional note from Gübelin indicating it is from the Mogok region.

Lot 517. 6.92 carats Burmese ruby and diamond ring, M. Gérard. Estimate 175,000 — 245,000 CHF. Lot sold 218,500 CHF. Photo: Sotheby's 2012

The oval ruby weighing 6.92 carats set within borders of brilliant-cut and pear-shaped diamonds, signed M. Gérard and numbered, French assay and maker's marks.

Accompanied by SSEF report no. 64397, dated 7th August 2012, and Gubelin report no. 0107068, dated 17th July 2001, stating that the ruby is of Burmese origin with no indications of heating.