A superb 3.81 carats fancy intense blue diamond ring. Sold for £2,322,500 (€2,712,630) at Bonhams London, 20 Sep 2016, lot 126. Photo Bonhams.

A 14.13 carats Kashmir sapphire single-stone ring. Sold for £1,385,000 (€1,617,650) at Bonhams London, 4 December2016, lot 121. Photo Bonhams.

An important 17.97 carats Type IIa diamond solitaire ring. Sold for US$ 1,447,500 (€1,373,209) at Bonhams New York, 6 December 2016, lot 618. Photo Bonhams

A magnificent 15.52 carats Type IIa diamond single-stone ring, by Harry Winston, circa 1973. Sold for £1,094,500 (€1,278,352) at Bonhams London, 20 April 2016, lot 132. Photo Bonhams

A Rare Sapphire and Diamond Ring, by Mouawad. Sold for HK$ 7,500,000 (€917,419) at Bonhams Hong Kong, 30 Nov 2016, lot 651. Photo Bonhams.

A 12.08 carats pear-shaped diamond single-stone ring. Sold for £773,000 (€902,847) at Bonhams London, 4 December 2016, lot 119. Photo Bonhams.

An Important 11.52 carats Colombian Emerald and Diamond Ring, by Harry Winston, 1976. Sold for HK$ 7,240,000 (€885,616) at Bonhams Hong Kong, 1 June 2016, lot 618. Photo Bonhams.

A 6.90 carats Kashmir sapphire and diamond ring, Shreve & Co., circa 1900. Sold for US$ 931,500 (€883,692) at Bonhams New York, 6 December 2016, lot 618. Photo Bonhams

A pair of late 19th century 8.97 and 8.93 carats Kashmir sapphire and diamond cluster earrings. Sold for £866,500 (€1,012,053) at Bonhams London, 20 Sep 2016, lot 125. Photo Bonhams.

An Extremely Rare And Impressive Art Deco Diamond Necklace, by Bulgari, Circa 1935. Sold for HK$ 6,280,000 (€768,186) at Bonhams Hong Kong, 1 June 2016, lot 621. Photo Bonhams.

A 11.00 carats marquise-cut diamond single-stone ring. Sold for £614,500 (€717,722) at Bonhams London, 20 Sep 2016, lot 125. Photo Bonhams

An Exceptional Ruby and Diamond Ring. Sold for HK$ 5,580,000 (€682,560) at Bonhams Hong Kong, 30 Nov 2016, lot 649. Photo Bonhams

An Important Kashmir Sapphire and Diamond Necklace, by Van Cleef and Arpels, Circa 1960. Sold for HK$ 5,560,000 (€680,114) at Bonhams Hong Kong, 1 June 2016, lot 619. Photo Bonhams.

An 11.17 carats diamond single-stone ring. Sold for £557,000 (€650,564) at Bonhams London, 4 December 2016, lot 116. Photo Bonhams.

A 7.13 carats Kashmir 'Royal Blue' sapphire and diamond cluster ring. Sold for £506,500 (€643,640) at Bonhams London, 20 April 2016, lot 129. Photo Bonhams

A 5.03 carats Fancy Coloured  Diamond and Diamond Ring. Sold for HK$ 4,800,000 (€587,148) at Bonhams Hong Kong, 30 Nov 2016, lot 550. Photo Bonhams

An important diamond rivière necklace, William Goldberg. Sold for US$ 581,000 (€551,181) at Bonhams New York, 14 october 2016, lot 120. Photo Bonhams

A Ruby and Diamond Necklace and Bracelet Suite, by Boucheron. Sold for HK$ 3,540,000 (€433,022) at Bonhams Hong Kong, 1 June 2016, lot 591. Photo Bonhams. 

An Important Diamond Single-stone Ring. Sold for HK$ 3,350,200 (€409,805) at Bonhams Hong Kong, 1 June 2016, lot 588. Photo Bonhams.