set of semi-precious stones

agate amethyst background black blue brown cabochon chalcedony charoite chatoyant chrysocolla chrysophrase chrysoprase close collection crystal crystalline eye gem gemstone granulite haematite hematite isolated jasper macro material mineral moganite natural obsidian pebble piece pink precious purple quartz rhinestone rock rose rough semiprecious set snowflake specimen stone tiger tigers variscite white