"Create an image of a variety of gemstones, each showcasing a different vivid color. Include gems such as emeralds (green), rubies (red), sapphires (blue), and amethysts (purple). The gems should be displayed against a neutral background, allowing the vibrant colors to take center stage. Each stone should be perfectly cut and illuminated to highlight its color and brilliance. The composition should feel luxurious and elegant, with soft shadows and reflections adding depth."