Ruby. The ruby is said to be the most powerful gem in the universe because of its high energy.

Which is the most powerful stone in astrology?

The strongest and most fast acting gemstone, Blue Sapphire or the Neelam is one of the most loved Gem amongst the nine planetary gemstones.

Which is the strongest gemstone?

Diamond is known to be the hardest and can scratch any other stone. Talc is the softest.