Choose the crystal necklace that will coordinate with your own charms or let them choose them for you. The chain, clasp, as well as the 5 cm extension, are made of steel with gold plating. The options you have are tourmaline, jasper, agate, tourmaline, apatite, turquoise, cornelian, tiger's eye.

The first photo is the selection of the tourmaline necklace

you can find the properties of crystalshere: