Yusak from Indonesia described me how he uses a moldavite for meditation.
I like moldavites for their strong vibrations. I think that moldavites are the strongest stones.
I use moldavites for meditation that I practice usually 1 – 2 times per week.
Yusak recommends hand a moldavite in hands for two to fife minutes (especially during the meditation). After this time you can feel moldavite vibration. The effect is flush, like dizzy sensation. If you have a powerful moldavite and if you are very sensitive, you can throw up (but it is very rare).
Yusak has three moldavites and one is stronger then the others, also it takes longer to feel the vibration.