Size is as-packaged, or the diameter of loose marbles. ("D" is the diameter of round items other than marbles.)
This is a modern small mineral sphere suitable for collecting or as a premium shooter as it is literally hard as stone! Amethyst is a purple or violet form of transparent quartz, often used as a gemstone. These range from a milky quartz with a light purple tint to examples that appear almost black because the purple is so deep. Lots of inclusions lend interest and eye-appeal. You will not be disappointed!