amethyst crystals sparkle on dark surface. generative ai created gem texture. purple, violet tones. natural mineral gems. shiny

amethyst crystal gem gemstone mineral stone purple violet quartz diamond blue abstract isolated ice rock glasses jewelry texture shiny natural nature generative ai background design macro precious trendy modern pattern textures jewellery crystalbackground gembackground violettone purpletone shinygem gemtexture mineralgem naturalmineral crystaltexture