Starting with number 5, these are my favourites.
Estimate $300,000 - $500,000
Estimate $600,000 - $800,000
Estimate $60,000 - $80,000
Originally given to the Duchess of Windsor by King Edward VIII while still the Prince of Wales. Among the jewellery auctioned after the Duchess' death, Elizabeth outbid Prince Charles. I wonder if he will be bidding again.
Estimate $400,000 - $600,000
The natural pearl weighs approx 202.24 grains or 50.56 carats measuring approx 17.35-17.90 x 25.50mm. This pearl dates from the late 16th century. The bail is set with mine and rose cut diamonds in silver. The bail dates from the early 19th century. The necklace consists of 56 natural pearls, 4 cultured pearls and diamond and ruby stations made of platinum and gold. Elizabeth had Cartier make the necklace in 1972. Personally I prefer the seed pearl and platinum chain that accompanied the pearl drop when Richard Burton purchased it in 1969.