How does the marble stay in there ? Each piece we make uses the same principal, tension, and that is the basic engineering principal of our entire product line. You simply pull the marble out, select the next marble color you want to use, and put it in place. If the marble is slightly loose in the holder, take the marble out again, gently squeeze the cups toward each other, and put the new marble back in. We have screened all the marbles for the kits, so we know they will all fit in the holder. They may vary a millimeter or so, but within the tolerances in your kit, they will all work!
Is there a difference between the marbles? Each piece of jewelry is made to fit one size of marble. Different colors and types of marbles are available in the different sizes. To read more about which colors and types of marbles come with each marble kit, click About Marble Sizes.
The Simple Pendant looks two toned, is it gold too? The arched bar that connects the two cups is bronze, which is a very strong, yet flexible metal that will hold its shape after repeatedly interchanging the marble. The rest of the pendant is sterling silver.