"A dust-devil looks essentially like what you would expect from the movies - a tiny tornado that is lifting dust, " explained Manuel de la Torre Juarez of Nasa's Jet Propulsion Laboratory (JPL) and a scientist on the Rover Environmental Monitoring Station (Rems) instrument.
Different companies will have different definitions of 'unoccupied so you should dust down your policy document and have a look to see what is covered.
And if the spa's gem associations are a stretch, they're comparable to what others are doing, like using diamond dust in anti-aging body treatments and here, for obvious reasons, sapphire dust as well (which felt great in a body cream but didn't have any discernible effect).
With integrated social media and a secondary notification screen, users can stay on top of what really matters to them, and being splash and dust-resistant, they can get into the action without worry.