From Wimbledon to ‘The Lion King’ premiere, the British royals have been out and about as of late. But now, the Duke and Duchess are officially on summer break, reported Caroline Hallemann for Town & Country. The royal family typically takes holiday in July and August, she wrote.

They might have a nice vacation or two planned, but their $500 million-plus net worth doesn’t even make the cut for the top 10 richest royals worldwide.

Read more: Meghan Markle and Prince Harry broke royal tradition hours after their first child was born. Here are 11 ways the couple is modernizing the monarchy.

Where some European royals have the highest net worth among the continent’s royal families – such as Prince Albert II of Monaco – they rank much lower compared to other royal families around the globe.

Here's how much the world's richest ruling royals are worth, based on the most recent net worths available for them. Note that net-worth estimations may fluctuate.

Hint: They're all billionaires.

10. Prince Albert II, Monaco

Foto: sourcePascal Le Segretain/Getty Images

Net worth: $1 billion

Prince Albert II of Monaco's net worth reportedly comprises one-fourth of the land he reigns over, as well as an antique car collection, shares in a Monte Carlo resort, a pricey stamp collection, and the Philadelphia-area home of his mother, Grace Kelly, which he purchased in 2016 for an estimated $754,000.

9. Emir Sheikh Tamim bin Hamad Al Thani, Qatar

Foto: sourceCarl Court/Getty Images

Net worth: $1.2 billion

Emir Sheikh Tamim bin Hamad Al Thani took over the throne of Qatar after his father, former emir Hamad bin Khalifa Al Thani, stepped down in 2013.

The former emir's estimated net worth of $2.4 billion comes from Qatar Investment Authority, which manages the country's oil and gas reserves.

8. King Mohammed VI, Morocco

Foto: sourceGetty Images

Net worth: $2.1 billion

King Mohammed VI's wealth largely comes from his family's ownership of Morocco's National Investment Company, a private holding company that invests in other African countries and operates in banking, telecommunication, and renewable energy.

7. Prince Hans-Adam II, Liechtenstein

Foto: sourceEddy Risch/AP Photos

Net worth: $3.5 billion

The Princely House of Liechtenstein's fortune is largely due to its privately owned bank, LGT Group, and investments made through the Prince of Liechtenstein Foundation, which oversees real-estate, forest, and winery assets.

6. Grand Duke Henri, Luxembourg

Foto: sourceMark Renders/Getty Images

Net worth: $4 billion

The Grand Ducal Family of Luxembourg doesn't receive a salary but has been granted about $324,851 every year since 1948 to carry out functions - not that they need it, as their net worth is in the billions.

5. Emir Sheikh Mohammed bin Rashid Al Maktoum, Dubai, United Arab Emirates

Foto: sourceAlastair Grant/AP Photos

Net worth: $4 billion

Mohammed bin Rashid Al Maktoum - the vice president and prime minister of the United Arab Emirates and the emir sheikh of Dubai - has spent some of his wealth on charitable donations, such as $10 billion to create the Mohammed bin Rashid Al Maktoum Foundation, which focuses on helping future generations.

4. Emir Khalifa bin Zayed Al Nahyan, Abu Dhabi, UAE

Foto: sourceWPA Pool/Getty Images

Net worth: $15 billion

Khalifa bin Zayed Al Nahyan, the president of the UAE and the emir of Abu Dhabi, has amassed a fortune as chairman of the Abu Dhabi Investment Authority, which manages the UAE's excess oil reserves.

3. King Salman bin Abdulaziz Al Saud, Saudi Arabia

Foto: sourcePool/Getty Images

Net worth: $18 billion

The source of King Salman bin Abdulaziz Al Saud's wealth comes from his family's ownership of a media group that includes the pan-Arab daily Asharq Al-Awsat and Al Eqtisadiah.

2. Sultan Hassanal Bolkiah, Brunei

Foto: sourceDrew Angerer/Getty Images

Net worth: $20 billion

The sultan of Brunei profits well from the oil and gas industry - he lives in the world's largest palace, which costs more than $350 million, and is said to own more than 600 Rolls-Royces.

1. King Maha Vajiralongkorn, Thailand

Foto: sourcePool/Getty Images

Net worth: $30 billion

King Maha Vajiralongkorn and his family made their money from investments derived from the Crown Property Bureau, which manages the property of the crown of the Kingdom of Thailand.

He also owns the 545-carat Golden Jubilee Diamond, the world's largest cut and faceted diamond, according to TIME.