Question - Use of competitor's trademark in promotional materials

[domdia]

Hello everyone!

Would be grateful if you could advise, or point in the right direction, regarding the following question:

Would a new jewellery brand be allowed to mention in their marketing and promotional materials that their designer used to work for a well-know brand which holds trademarks in the respective product groups (Swarovski could be a good example)?

Thank you for your help!

Dom