The British Crown Jewel – These are perhaps the most famous in the world, encompassing several crowns, sceptres, orbs, swords, and robes, many encrusted with priceless gems. The Imperial State Crown, used at the coronation of the British monarch, features some of the most renowned stones, including the Cullinan II diamond, the Black Prince's Ruby (actually a large spinel), and the Stuart Sapphire.
The Patiala Necklace – Originally crafted by Cartier in 1928 for Maharaja Bhupinder Singh of Patiala, India, this necklace originally featured nearly 3,000 diamonds including the world's seventh-largest diamond at the time, the "De Beers". Although parts of it have since been lost or sold, it remains one of the most magnificent examples of royal Indian jewellery.
The Hope Diamond – Although not currently in a royal collection, this famous 45.52-carat diamond has a history of royal ownership, including that of King Louis XIV of France. It is now housed in the Smithsonian Museum in Washington, D.C. The deep blue diamond is notorious for its supposed curse, bringing bad luck to its owners.
The Imperial Crown of Russia – Used by the monarchs of Russia from Catherine the Great until the monarchy's abolition, this crown is adorned with nearly 5,000 diamonds arranged in intricate designs and the famous red spinel weighing approximately 398.72 carats.
The Swedish Leuchtenberg Sapphire Parure – A beautiful and historic set of jewellery, originally owned by the Duchess of Leuchtenberg, features magnificent sapphires and diamonds. It's often worn by members of the Swedish royal family on formal occasions.
The Norwegian Emerald Parure – A stunning set of emerald jewellery that was originally owned by Napoleon Bonaparte's wife, Empress Josephine. This parure has been handed down through the Norwegian royal family and is frequently worn by Queen Sonja of Norway on state occasions.
The Iranian Crown Jewel – Considered one of the largest and most dazzling collections in the world, the Iranian Crown Jewels include items like the Darya-i-Noor Diamond, one of the largest pink diamonds globally, and an array of other crowns, thrones, and various pieces encrusted with thousands of precious gems.
The Saudi Arabian Collection – The royal family of Saudi Arabia owns an extensive collection of jewellery, including numerous modern pieces that are laden with large diamonds and other precious stones, reflecting the nation's immense wealth and status.