Helzberg — Ransomware Incident Claimed by Coinbase Cartel
- Victim: Helzberg
- Claimed by Coinbase Cartel
- Date claimed: 2026-04-12
- Country: US
- Sector: Consumer Services
Helzberg Diamonds is a American retail jewelry company headquartered in North Kansas City, Missouri. Founded in 1915, it operates a chain of jewelry stores across the United States, selling diamonds, engagement rings, wedding bands, and fine jewelry. The company is a subsidiary of Berkshire Hathaway, having been acquired in 1995. Helzberg operates hundreds of retail locations in shopping malls and centers nationwide.