Turquoise fosters the recognition, and development of a conscious neutral space between the neural system and the meridian system. This allows the experience of space between what is directed towards us, and our choice in how to accept that. Not only does this apply to energies we are receiving but also those we are communicating to others.
This development works with the conscious recognition of All as frequency and the choice we have regarding, how we receive, or radiate frequency at any level. This aspect of the action of turquoise is, I believe, the crux of its reputation for protection.