Mutya Variations
The Mutya is well known by the inhabitants of Marinduque, who have identified many power stones. There is the so-called mutya sa igat, a slippery stone found tucked in special eel's nape, which can grant its bearer stealth skills. There is also the mutya sa bato, which gives the power of invincibility. The mutya sa langka brings luck to its bearer. The mutya sa kalabaw is the power stone of strength. The wishing stone is the mutya sa sampaloc. There are many more mutyas in Marinduque folklore. I have an officemate from Batangas whose healer grandfather possesses the Alam, another term for mutya. It is a small pebble believed to reside within the throat, which grants the human vessel healing powers. Before death, the human vessel possessing the Alam must pass on to another individual, whether willingly or not.

The Evil Mutya
It seems that this stone can grant its wielder special attributes belonging to higher evolutionary beings, super strength, psychic abilities and wisdom, if used for good. This same object can corrupt the wielder if used for evil. Stories of aswangs in the countryside relate that these creatures are actually transformed sorcerers, described as anti-social and reclusive, who use these stones for ill. This corrupted mutya also needs to be passed to another before the bearer passes away. If left without a human vessel, this corrupted mutya explodes into a ball of fire.

The nature of these mutya stones are not yet fully understood and need further study. It is the author's hope that more information be gathered regarding these mysterious objects.