Pearl spent by various crystals, each crystal is again different mineral composition, crystal structure of these minerals formed determines that it is marble or limestone or granite. In order to ensure the integrity of the crystals in particular, they must contact the air oxygen in the air, so you must let them breathe. in addition, when the water into the stones should flow out through the gap to evaporate.
The most important thing is rarely taken into account the interaction point is crystal stone structure and survival of millions of bacteria in the pores. After a long study, it was found that the bacteria in keeping intact the stone seems to play an important role, but it is by what means do it? research has yet to be. in order to ensure the survival of these bacteria multiply, not only when using sealants can not hurt them but also to promote its activity.
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