As all our experts said synthetic gemstones are man-made which which does not have astrological powers.
For an example; human created robots but they are not better than god gifted humans. And even natural water is better than synthetic water; you agree to that, right? And synthetic gemstones may carry negative energies rather than positive energies. So instead of getting good positive energy to fight with existing negative energy one is actually strengthening the negative energy more and its nothing but putting an hammer on one’s own foot.