I think your marble site is wonderful. I am so pleased to be able to find real rock crystal marbles. I use them in jewelry making. Finding 1/2" to 3/4" undrilled rock crystal beads has been nearly impossible. I'm glad I finally found a source.
Size is as-packaged, or the diameter of loose marbles. ("D" is the diameter of round items other than marbles.)
Opaque white base swirled with many colors; pink, red, yellow, sky blue and green! Iridescent finish. 25 glass marbles (one of them is a 1" shooter!) with colorful header card printed with game rules and fun facts. Don't forget something to keep the marbles in!