Not for any magical power, but for biblical reasons: >Revelation 21:19 The foundations of the wall of the city were adorned with every jewel; the first was jasper, the second sapphire, the third agate, the fourth emerald, 20 the fifth onyx, the sixth carnelian, the seventh chrysolite, the eighth beryl, the ninth topaz, the tenth chrysoprase, the eleventh jacinth, the twelfth amethyst. Is it ok to decorate my prayer space with similar rocks? For the aesthetics?