18 Karat Two-Color Gold, Diamond and Yellow Diamond Necklace. Photo Sotheby's

Of openwork design, the collar set throughout with numerous round near colorless diamonds weighing approximately 22.15 carats, the front accented by pear and heart-shaped diamonds of yellow hue weighing a total of approximately 22.00 carats, length 15½ inches. Estimation: 85,000 - 110,000 USD 

Sotheby's. Important Jewels, New York | 20 sept. 2012. www.sothebys.com