SOURCING AQUAMARINE STONES AND BEADING MATERIALS In addition to the cross pendant, you will need several aquamarine stones and beading materials. You can find the aquamarine stones at your local craft store or order them online. Be sure to get enough to create the length of the necklace you want. To complete the necklace, you will also need a beading thread, crimp beads, and jump rings. Beading pliers will also come in handy.