The story
Société Belge de Banque established the Comptoir Diamantaire Anversois (CDA) in 1934, in partnership with Banque Transatlantique, Société Internationale Forestière et Minière du Congo, and the De Beers Group. The CDA was the first financial institution to focus solely and entirely on the needs of the diamond industry. It opened its registered office in the Antwerp diamond district.
In 1937, Belgium passed bank reform legislation that allowed the CDA to become a bank, upon which the company changed its name to Antwerp Diamond Bank. It simultaneously doubled its equity base to BEF60 million (approximately 1.5 million euros), by bringing in the Kredietbank and Banque de Bruxelles as shareholders.
From Wikipedia’s article on Antwerp Diamond Bank, shared under CC BY-SA 4.0.5