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.
There are eight types of basic color schemes to choose from: 1  Complementary: Complementary or opposite colors from the color wheel. 2  Split Complementary: Three colorsâthe main color and colors from either side of its complement. 3  Triad: Three colors from equidistant points on the color wheel. Monochromatic: Different shades and depths of a single color. Analogous: The main color and the colors from either side of it on the color wheel. Neutral: Uses a color that has been reduced by adding black. Achromatic: No colorâjust blacks, whites and greys.