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I would be very interested in the charms, especially if they were nickle free as I am allergic to that metal, and if you added crystals, I do not know if it would be more expensive or less

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Many charms out there today are pure silver or gold, or silver-plated-over-brass/ gold-plated-over-brass. Some are plated-over-copper. I've yet to run across those that included nickel. (As a beadweaver and a beading business owner, I watch those things in the market.)

As for adding crystals, it would make it cost more, yes, but how much more depends on the type of crystal. If one is talking about the Swarovksi leaded-glass crystals from Austria, they're between .04 cents to .15 cents per 4mm bead (obviously, it varies by size), the lowest price being the wholesale price. True crystal - gemstones like amethyst, rose quartz, diamond, etc, obviously would cost much more per piece.

Just some info from my vast repertiore of knowledge.