David Bennett, worldwide chairman of Sotheby’s International Jewellery Division, who is often dubbed the “100-carat man” because of his unparalleled record of having auctioned seven 100-carat diamonds, introduced the elite audience (in Dubai) to the art of jewelry collecting with an emphasis on assessing gemstones; identifying jewels from a wide range of periods of jewelry…

Working in iron wire the diameter of a clothes hanger, Southwest France-based sculptor Marie Christophe — whose clients include Hermès, Dior, Roger Vivier and the interior designer Jean-Louis Deniot — fashions animals, light fixtures, fanciful birdcages and other seemingly gossamer objets. Some pieces are beaded, like an elephant with crystal-strewn butterfly wings for ears that…