Stones are blue ray.

As blue stones are carry for blue rays, regulating and transferring impulses are vibrating equivalents of an own organs, feels in brain, where they are manufacturing, filling for memory, or having a motivation for effect, as ,like a blue ray helps for blood current in our vessels blood, blue energy gives for a needing mind current, as impressions,and giving for brain a new productive habits.
As stones are blue rays are blue Sapphire, aquamarine, lapis lazule , blue agate, azurite, blue tourmaline, turquoise.

Blue Sapphire is a most power from a blue stones, this Crystal, manufactured ,like disk or ball, as giving an energy for blue ray in our body, as on an old time his weard when peoples addressed to oracle or opened third eye, as here is intuition form with a non visible inside forces, stimulating and raising by Sapphire.
As helps to add collaboration between a soul and high mental functions, helping for retina cells cleaning,sensitiveness to the blue light, and activating current for impulses in vision centre for bark of cerebral brain.