Cut Purple Sapphire, Color Change Gemstones artifacts of science 1x small brass lap nut

1x small brass lap nut (note: due to more recent changes to machine tolerances these may not fit well)

Nd YAG has been used in lasers since 1964

such as as an acousto-optical modulator

I cut this one myself in my 'Red Stone of Aja' design

Cut Purple Sapphire, Color Change Gemstones artifacts of science 1x small brass lap nutThese are faceted stones cut from labmade purple color change sapphire. Many of these stones have some nice color changes depending on lighting, and will show flashes of multiple colors under mixed lighting. Some have more or less of a color change, the photos show them under different lighting conditions in order to try to capture the colors. Color change sapphire is an all time classic. The color change aspect comes from vanadium, which is often