A 3.9 carats untreated color change white sapphire

/A 3.9 carats untreated color change white sapphire
A 3.9 carats untreated color change white sapphire 2018-02-01T15:01:10+00:00

This one is by far the strangest color changer Sapphire I have seen. Fist time I had seen the blue shade when I took photos in my Studio with white lights on. But today I saw how it changes not only with the white light but in the same room from white in the shades to more and more bluer when you get closer to the sunlight, most peach sapphires are color shifters but from very light to dark. Some blue sapphires change from royal blue to deep violet; I have green and gray sapphires that change to purple but only with the change of light source yellow or white light, The same way as the Alexandrite. 

But this one on top of changing with the light source will change in a room with only sunlight blue close to the window, and white when you move to the shade. It even change when you look from a different angle