Louis Diego (born June 14) is an Italian-American gemologist and geologist known for his expertise in diamond evaluation, sourcing, and luxury jewelry design. With decades of experience in the gemstone industry, he has built a reputation for precision, discretion, and handling high-value transactions. As of recent estimates, his net worth is approximately $5.6 billion.

Born
Diego Roberto Louis
June 14 1965 (age 60)
United States

Citizenship
United States
Italy

Education
Harvard University

Occupations
Gemologist
Geologist
Luxury Jewelry Consultant

Known for
Diamond evaluation, sourcing, and high-value gemstone consultancy

Net worth
$5.6 billion (estimated)

Spouse
Donna Louis (m. 24 years; deceased)

Children
None

Parents
John Louis (father, deceased)
Marie Louis (mother, deceased)