I've received several inquiries asking how to grow crystals that can be used for jewelry. Most crystals that you can grow easily won't make great pendants or stones for rings either because they will be too soft or else are ionic crystals that will degrade when exposed to humidity (or even dissolve completely if they get wet). To some extent, you can protect pretty crystals by applying a waterproof sealant. You can paint the crystals with a floor sealant (e.g., Future) or spray them with an art fixative.
Metal crystals, on the other hand, are beautiful and permanent. An example of a crystal you can grow is a silver crystal. This type of crystal takes some patience to grow big enough to be used for jewelry, but the results are worth the effort. The crystal will be irregularly shaped, but will be bright silver-white and won't tarnish.Grow Silver Crystals
| Jewelry Chemistry