31.34ct Victory step-cut diamond, certified by the GIA as a Type IIa, D Colour and potentially flawless (estimate: CHF 4,460,000 - 7,100,000/$5,000,000 - 8,000,000)

Van Cleef & Arpels 1956 necklace embellished with diamonds and a gold Myste`re IV fighter jet Sold for CHF 245,000 (estimate:CHF 20,000 - 30,000). Image by: Sothebys.