Chelsea color filter is a special optical lens that transmits only red and some yellow-green light and absorbs other colors. Chelsea filter is an auxiliary identification instrument, mainly composed of color filters with strong selective absorption, which allow some wavelengths of light to pass through and absorb the remaining visible light. Different gemstones have different selective absorption and different residual colors, so the reactions under the color filter are also different. The purpose of distinguishing gemstones can be achieved by using the different reactions of gemstones under the color filter. The Chelsea filter only allows deep red and yellow-green light to pass through, absorbing other visible light. High-quality optical glass filters, Never fades or comes off, Aluminum alloy frosted shell, exquisite and high-grade, Use a strong light source to illuminate the gemstone to be observed, and observe it with a color filter placed close to your eyes, Leather package