5. Iris Fontbona

Iris Fontbona

She was the second wife of the Chilean billionaire, Andrónico Luksic, and is now a widower. Her source of wealth is one of the world’s largest copper-mining companies Antofagasta plc.

Net worth: $17.8 billion, Age: 69

4. Gina Rinehart

Gina Rinehart

Born in Perth, Western Australia, she is an Australian mining industrialist and owns significant shares in Fairfax Media. She is the country’s richest woman.

Net worth: $18 billion, Age: 58

3. Alice Walton

Alice Walton

Born in Newport, Arkansas, she is an American heiress to the Wal-Mart company. She inherited the company from her father, Sam Walton, the founder of Wal-Mart. She is often listed amongst America’s top ten richest people.

Net worth: $23.3 billion, Age: 62

2. Liliane Bettencourt

Liliane Bettencourt

Born in Paris, she is the French heiress of the world’s biggest cosmetic company, L’Oréal. She is also a socialite and a philanthropist.

Net worth: $24 billion, Age: 89

1. Christy Walton

Christy Walton

She is the widow of John T. Walton, one of the sons of Sam Walton, the founder of Wal-Mart. She inherited his fortune worth $15.7 billion in June 2005, after her husband’s death. Today, she is the world’s richest woman.

Net worth: $25.3 billion, Age: 57