Lot 308. 2.31 carats marquise-shaped fancy vivid blue diamond ring. Estimate 1,780,000 — 2,770,000 CHF & Lot 309. 1.11 and 1.17 carats pear-shaped fancy intense blue diamond ring. Estimate 595,000 — 890,000 CHF. Photo: Sotheby's.

Lot 308. 2.31 carats marquise-shaped fancy vivid blue diamond ring. Estimate 1,780,000 — 2,770,000 CHF. Photo: Sotheby's.

Set with a marquise-shaped fancy vivid blue diamond weighing 2.31 carats, size 52.

Accompanied by GIA report no. 1176433353, stating that the diamond is Fancy Vivid Blue, Natural Colour, SI1 Clarity. 

Lot 309. 1.11 and 1.17 carats pear-shaped fancy intense blue diamond ring. Estimate 595,000 — 890,000 CHF. Photo: Sotheby's.

Of toi et moi design, set with pear-shaped fancy intense blue diamonds weighing 1.11 and 1.17 carats, size 48. 

Accompanied by GIA report no. 5172433365 and no. 6177433364, stating that the diamonds weighing 1.11 and 1.17 carats are Fancy Intense Blue, Natural Colour, VS1 and SI2 Clarity.

Sotheby's. Magnificent Jewels and Noble Jewels, Geneva, 16 Nov 2016, 10:30 AM