Cambridgeshire stonemasonry Atelier 109 Ltd has been fined £5,000 and ordered to pay costs of over £1,400 for endangering its workers.
The charge comes after the company appeared on the BBC2 Series Mastercroft and a viewer made a complaint. The programme showed the firm having inadequate precautions for dangerous stone dust that could cause workers serious lung disease.
After the hearing, HSE inspector Alison Ashworth said: "Atelier were happy to get their moment on television, but rather less quick to protect their employees from a wholly avoidable risk that can have serious consequences and cause respiratory diseases.
"We understand the pressure that small businesses are under and this company was given ample opportunity on a number of occasions to make the necessary improvements. HSE only brought this prosecution when it became clear that the company was dragging its heels and failing to treat this issue with the seriousness it deserved.
"If you are a company and are issued with a notice requiring improvements to be made you can be expect to be prosecuted if you do not comply."