Lot 273. A 7.34 carats brilliant-cut diamond single stone ring. Estimate GBP 140,000 - GBP 180,000 (USD 185,920 - USD 239,040). © Christie's Images Ltd 2017

The pear brilliant-cut diamond, weighing approximately 7.34 carats, to triangular-cut diamond shoulders, ring size M½.

Accompanied by report no. 8537901 dated 3rd August 2017 from the GIA Gemological Institute of America stating that the diamond is D colour, VS2 clarity.

Lot 272. A 12.31 carats Fancy Yellow diamond single stone ring. Estimate GBP 90,000 - GBP 120,000 (USD 119,520 - USD 159,360). © Christie's Images Ltd 2017

The cut-cornered square modified brilliant-cut Fancy Yellow diamond, weighing approximately 12.31 carats, to triangular-cut diamond single stone shoulders, ring size M½.

Accompanied by report no. 8430071 dated 3rd August 2017 from the GIA Gemological Institute of America stating that the diamond is natural Fancy Yellow, VVS2 clarity, also with a working diagram indicating that the clarity of the diamond is potentially Internally Flawless.

Christie's. Important Jewels, 29 November 2017, London