A pulsar (short for pulsating radio star) is a highly magnetized, rotating neutron star that emits a beam of electromagnetic radiation.
Tourmaline is the most colorful of all gemstones. It occurs in all colors, but pink, red, green, blue and multicolored are its most well-known gem colors. Scientifically, tourmaline is not a single mineral, but a group of minerals related in their physical and chemical properties.
Blue tourmaline can range in tone from light to dark. The hue is often modified by green so you can have a blue color with just a little bit of green modifying color or a color that is very greenish but still blue. Some tourmalines have an even amount of green and blue to the color.