The register
Diamond-cube Limited, London, holds a Home Office sponsor licence on the Skilled Worker route, and has been on the register since at least 2026. Rating on the current register: Worker (A rating).
Companies House lists it as Diamond-cube Limited, number 12110351, incorporated 2019: 7 years of filings behind the name. The registered office is at 16 Upper Woburn Place, London, WC1H 0AF, WC1H 0AF. Its filed activity puts it in finance and insurance.
Holding a licence is the expensive, slow part done. For Diamond-cube Limited the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.