GENEVA, SWITZERLAND - MAY 7: 1950s Colombian Emerald and Diamond Necklace fringed with large pear-shaped emeralds (Est. 1 2 million USD) is displayed as Sotheby's unveiled this morning highlights from its seasonal Geneva Important Watches and High Jewelry Sales, taking place live at the city's Mandarin Oriental Hotel on Sunday, 10 May from 11am CEST and Tuesday, 12 May from 2pm CEST. Both auctions will also be accessible online worldwide. Among the standout pieces is the jewellery sale's top lot: an exceptional six-carat Fancy Vivid Blue Diamond estimated at 912 million USD. The internally flawless stone comes from South Africa's Cullinan mine, source of several record-breaking blue diamonds. Also featured is a necklace, earring and bracelet set designed by Rihanna in collaboration with Chopard, first unveiled at the 2017 Cannes Film Festival and now appearing publicly and at auction for the first time. The necklace alone carries an estimate of 260,000380,000 USD. Additional highlights include a pair of perfectly matched unmounted 18.38-carat white diamonds sourced by De Beers (2.83.5 million USD), a likely unique 1928 ruby and diamond necklace by Lacloche Frères (200,000350,000 USD), and a 1950s Colombian emerald and diamond necklace estimated at 12 million USD. Leading the Important Watches Sale is an extremely rare 1916 A. Lange & Söhne Grand Complication Pink Gold Clock Watch estimated at 880,0001.5 million USD. Also featured is a rare 1969 Rolex Daytona "Paul Newman John Player Special" in 14-carat yellow gold (570,0001.1 million USD). The sale will additionally present pieces from the Shapes of Cartier Collection, the most comprehensive Cartier watch collection ever assembled, following record-breaking results in Hong Kong last month, including a world-record sale for a Cartier Crash on May 7, 2026 in Geneva, Switzerland. (Photo by Robert Hradil/Getty Images for Sotheby's)

(FILES) David Attenborough arrives on court to watch the men's singles tennis matches on the first day of the 2024 Wimbledon Championships at the All England Lawn Tennis and Croquet Club in Wimbledon, southwest London, on July 1, 2024. David Attenborough, a leading voice on climate change and biodiversity loss whose landmark documentaries transformed popular understanding of the natural world for a global audience, marks his 100th birthday on May 8, 2026. (Photo by Glyn KIRK / AFP via Getty Images) / RESTRICTED TO EDITORIAL USE

A tanker, left, and a car carrier are anchored at sea in the Gulf of Oman near the Strait of Hormuz, as seen from the coast near Khor Fakkan, United Arab Emirates, Friday, May 1, 2026.(AP Photo/Fatima Shbair)

SAN DIEGO, CALIFORNIA - MAY 07: Victor Scott II #11, Jordan Walker #18 and Nathan Church #27 of the St. Louis Cardinals celebrate after defeating the San Diego Padres 2-1 in a game at Petco Park on May 07, 2026 in San Diego, California. (Photo by Sean M. Haffey/Getty Images)

SAN DIEGO, CALIFORNIA - MAY 07: Riley O'Brien #61 and Pedro Pagés #43 of the St. Louis Cardinals celebrate after defeating teh San Diego Padres 2-1 in a game at Petco Park on May 07, 2026 in San Diego, California. (Photo by Sean M. Haffey/Getty Images)

THREE RIVERS, TEXAS - MAY 07: In an aerial view, the Choke Canyon Reservoir is seen within the Choke Canyon State Park on May 07, 2026 in Three Rivers, Texas. Corpus Christi relies heavily on the Choke Canyon Reservoir for water supply. As the reservoir's water levels continue declining due to prolonged drought, the city of Corpus Christi loses a major portion of its water reserve. Corpus Christi City Council has voted to begin preliminary discussions on building a desalination facility for the Coastal Bend region as the city faces a looming water crisis driven by rising temperatures, prolonged drought conditions, and increasing demand from local oil refineries. If city leaders are unable to secure a workable long-term solution—such as drilling additional groundwater wells or moving forward with desalination projects—Corpus Christi could declare an unprecedented Level 1 water emergency by September of 2026. Such a declaration would require a 25 percent reduction in water usage for both residents and industrial users, including refineries. (Photo by Brandon Bell/Getty Images)

THREE RIVERS, TEXAS - MAY 07: In an aerial view, a dried portion of land is surfaced at the Choke Canyon Reservoir within the Choke Canyon State Park on May 07, 2026 in Three Rivers, Texas. Corpus Christi relies heavily on the Choke Canyon Reservoir for water supply. As the reservoir's water levels continue declining due to prolonged drought, the city of Corpus Christi loses a major portion of its water reserve. Corpus Christi City Council has voted to begin preliminary discussions on building a desalination facility for the Coastal Bend region as the city faces a looming water crisis driven by rising temperatures, prolonged drought conditions, and increasing demand from local oil refineries. If city leaders are unable to secure a workable long-term solution—such as drilling additional groundwater wells or moving forward with desalination projects—Corpus Christi could declare an unprecedented Level 1 water emergency by September of 2026. Such a declaration would require a 25 percent reduction in water usage for both residents and industrial users, including refineries. (Photo by Brandon Bell/Getty Images)

MATHIS, TEXAS - MAY 07: In an aerial view, docks are seen on a dried up portion of Lake Corpus Christi on May 07, 2026 in Mathis, Texas. Lake Corpus Christi, a man-made reservoir and primary water source for Corpus Christi, has dropped to its lowest levels since 1958 according to city officials. The reservoir serves as a primary water source in sustaining the city's long-term water demands. Corpus Christi City Council has voted to begin preliminary discussions on building a desalination facility for the Coastal Bend region as the city faces a looming water crisis driven by rising temperatures, prolonged drought conditions and increasing demand from local oil refineries. If city leaders are unable to secure a workable long-term solution - such as drilling additional groundwater wells or moving forward with desalination projects - Corpus Christi could declare an unprecedented Level 1 water emergency by September 2026. Such a declaration would require a 25 percent reduction in water usage for both residents and industrial users, including refineries. (Photo by Brandon Bell/Getty Images) *** BESTPIX ***