After choosing Gemstone(s)

Getting back to Gemstones... this site is very clear about all things..."Gemstones"... 

I have gotten a lot of what I need from this site alone...more than any other ♥

Cleaning Gemstones - How to cleanse your stones

There are many methods in use today for cleaning gemstones and crystals in order to increase the effects of their metaphysical energies.

Stones are believed to have an extensive memory, remembering where they've been, who they've touched, and all forces and energies that have surrounded them. A stone can pass onto others any energy that it has stored within it. Periodically, stones need to be cleansed of any unwanted energies that they may have collected from you, from others, or from the environment.

For instance, healers take care to clean their healing stones after each use because the stones might take pain (both physical and emotional) into themselves and pass it onto others if they have not been cleansed of those energies between uses. If a stone has absorbed negative energies, it may not work well for whatever purpose it has been programmed.

http://crystal-cure.com/article-cleaning-gemstones.html