Create a vibrant pixel art t-shirt design featuring an array of colorful gemstones inspired by classic video games. The design should include emeralds, rubies, sapphires, and amethysts, each uniquely shaped (e.g., round, oval, square) and rendered in a 32x32 pixel size for clarity. Use a vibrant color palette with shades of green for emeralds, red for rubies, blue for sapphires, and purple for amethysts, ensuring high contrast for visibility on fabric. Each gemstone should have a strong 2-pixel outline to enhance clarity and separation. Arrange the gemstones in a scattered layout to create a dynamic composition, with subtle highlights (1-2 pixels) on the upper left or right corners to simulate light reflection and give the gems a shiny appearance. The final design should be saved in a high-resolution PNG format with a transparent background for easy printing. Consider adding a slight drop shadow effect to the gemstones for depth.