What role do gemologists play in the discovery and authentication of rare diamonds?

Apr 8, 2025 ... See The World's Rarest Diamonds, Worth a Total of $100 million, in Abu Dhabi ... Sotheby's, in partnership with the Abu Dhabi Investment Office, ... From canary yellow to exceptionally rare red, blue and green, we take a look at the top 10 most expensive coloured diamonds in the world. Dec 8, 2023 ... ... diamonds in the world. This historic gem has passed through the ... Aside from their beauty and brilliance, these exceedingly rare 100 ... Feb 5, 2024 ... Red Diamonds. Red diamonds are the rarest of the coloured diamonds, with only 20-30 existing across the world. The rich red tone is achieved by ... Sep 14, 2022 ... The Koh-i-Noor (Mountain of Light Diamond) ... The most valuable diamond in the world is Koh-i-Noor, also spelled Koh-i-Nur and Kohinoor. The ... 10. The Moussaieff Red Diamond — Up to $8 million ... Starting our list of the top most expensive diamonds in the world is the Moussaieff Red ... The Cullinan II, also called The Star of Africa, is worth about $400 million and is the largest polished white diamond in the world. Feb 18, 2025 ... Natural red diamonds are among the rarest gemstones on Earth, and the Winston Red Diamond stands out as exceptional. At 2.33 carats, it ranks ... Fancy color diamonds are known for their exquisite beauty. These rare gemstones account for less than 0.1% of the annual production of all diamonds in the world ... Taking place at the Bassam Freiha Art Foundation, an architectural marvel and visionary not-for-profit situated on Abu Dhabi's Saadiyat Island, Sotheby's ...