Rock crystal jewelry is an essential in lithotherapy. If you could only have one stone, this would be it. Rock crystal is a pure, transparent quartz, without any coloration: it is the most accomplished form of silicon dioxide, the same mineral that gives rise to amethyst, rose quartz, or citrine, depending on the impurities it contains. Its perfect transparency has fascinated humanity since the beginning of time. The ancient Greeks believed it was eternal ice petrified by the gods (the word krystallos means "ice"), shamans of all cultures used it as a divination tool, and Swiss watchmakers exploited it for centuries for the precision of its oscillations.
In lithotherapy, rock crystal is the universal amplification stone. It doesn't have one specific virtue; it has them all, or rather, it amplifies the energy of everything around it. Placed next to an amethyst, it enhances calming properties. Combined with a tiger's eye, it multiplies protection. Worn alone, it clarifies thoughts, purifies the aura, and harmonizes all chakras. It is the Swiss Army knife of lithotherapy, the partner of all other stones. It works on the crown chakra but acts on all energy centers indiscriminately.
Rock crystal literally pairs with all stones; that's its strength. For maintenance, a rinse with clear water and recharging in sunlight or moonlight are sufficient. It is an easy-to-live-with stone with a hardness of 7 on the Mohs scale. And the icing on the cake: rock crystal can purify and recharge your other stones simply by placing them on or next to it.