What causes the boron in blue diamonds?

6 days ago ... The Pink Star is the most expensive diamond in the world, sold for $83 million. Known for its vivid pink colour and flawless clarity, ... This elegant and rare blue diamond costs around $250 million. It weighs about 45.52 carats, which is very exceptional. Apr 8, 2025 ... “The largest red diamond in the world is 5.11 carats, and this is 5.05 carats,” says Redmayne. Red diamonds are so rare, he adds, that legendary ... Apr 10, 2023 ... These five diamonds are some of the rarest and most valuable gemstones in the world. Their rarity is due to their unique colors, sizes, and exceptional ... 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 ... Jul 1, 2022 ... Ever wonder what is the rarest cut of diamond? The jubilee cut remains one of the rarest diamond cuts that do not feature a table; instead, it ... Sep 26, 2022 ... A beautiful blue flaw in a gem-quality diamond from Botswana is actually a tiny fragment of Earth's deep interior—and it suggests our planet's ... Mar 19, 2025 ... Red Diamonds: The Rarest Diamond Color in the World · This unique formation process is so exceptional that red diamonds typically range from just ... While red diamonds are the rarest option, make sure that you don't miss what's most important: you have options! If red isn't your style, you're lucky. You're ... Nov 18, 2021 ... Ring? Bracelet?) What follows are the most expensive and rare jewelry pieces sold for. 1. The Hope Diamond — $250 million.