Lack of evidence for Breo Tourmaline watch which claimed to improve concentration

I recently bought a Breo watch for £10 on a plane, because my regular watch broke on holiday. The advertising for the Breo Black Watch in British Airways and other in-flight shopping magazines describes it as "Comfortable on the wrist, this watch is made from tourmaline – a naturally occurring mineral said to be beneficial for the health – improving concentration, sleep, vitality and mood".

I emailed Breo and asked them “where is the tourmaline in this watch, and could they tell me what the evidence is that tourmaline has any effect on sleep, vitality and mood”.

I received a reply from the ‘Warehouse Administrator’ at Breo, and unfortunately she did not really answer my question. A quick bit of googling showed she had copied most of her response verbatim from an internet site, ‘globalhealingcenter.com’. She told me “In some of the Breo watches, there are indeed traces of the mineral Tourmaline” and stated that “Tourmaline gemstone is a semi-precious mineral stone well known for its incredible ability to aid in the detoxification process of the human body.”

I could write back to her with a critique of the paragraph she sent me, but I fear it will not get me any further in my hunt for evidence!