To date, Rosan Diamond has sold around 450 art collection cards.

The majority of Rosan Diamond's direct clients are businessmen from Eastern Europe, CIS, Malta, Switzerland and Latin America, Rosan Diamond's business development director Ruslan Aybazov told Business Insider.

According to Bloomberg, Insignia — one of Rosan Diamond's concierge partners, which is launching a new credit card service for members in 2020 — has 800 clients around the world. Approximately 50 are from the US, one quarter of whom are billionaires.