South London-based online jewellery retailer Jewellerybox has conducted research showing that the average British adult would have to work for more than 2,000 years before they could afford the world’s most expensive piece of royal jewellery.

What’s more, the top four most expensive pieces of royal jewellery in the world are all owned by the British Royal Family.

The Nizam of Hyderabad Necklace owned by Kate Middleton comes in at the number one spot, costing £66.3 million. Jewellerybox revealed that it would take someone earning the average London wage 1,718 years to earn enough money to purchase the necklace. The same estimate based on average wages in other UK cities all come in at above 2,000 years.

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Meanwhile, Queen Elizabeth II’s Cullinan III and IV jewels come in at second, costing £50 million and taking well in excess 1,500 years of work to for the average worker to purchase in all listed cities except the English capital.

Image courtesy of Jewellerybox

The Queen’s Williamson Diamond Brooch comes in at third place, costing £25 million, while the Greville Emerald Kokoshnik Tiara owned by Princess Eugenie is at joint fourth place costing £10 million.

Pieces owned by the royal families of Norway, Yugoslavia and Iran all appear in the top 10, but there are a further three pieces owned by the UK Royal Family too.

Meanwhile, the report says, the world’s four most expensive pieces of royal jewellery, costing a combined £151.3 million, are all owned by the British royal family.

Elsewhere, 19 out of the 47 most expensive royal jewels featured in this research are owned by the British royal family and are worth £199.1 million.