The image is a chart titled "Dichroism and Spectra of Precious Stones". It displays nine different gemstones, each with a color representation of its dichroism. The gemstones are arranged in a 3x3 grid. Here's a breakdown of each gemstone and its color representation: 1. Sapphire: A square with a blue and purple gradient. 2. Ruby: A square with a red and orange gradient. 3. Emerald: A square with a green and yellow gradient. 4. Peridot: A square with a green and yellow gradient. 5. Iolite: A square with a blue and purple gradient. 6. Brown Tourmaline: A square with a brown and red gradient. 7. Andalusite: A faceted gemstone with a red and green color scheme. 8. Brown Tourmaline: A faceted gemstone with a brown and red color scheme. 9. Alexandrite: A faceted gemstone with a green and yellow color scheme. The chart appears to be from an older scientific or educational publication, given its style and the way the information is presented.