Crystals & Stones

Blue sapphire crystal specimen — Roosters Peacock crystal guide
Blue Sapphire: The Stone of Wisdom, Integrity & Clear Commitment
Blue Sapphire is gem-quality corundum, Al2O3, colored chiefly by trace-element interactions involving iron and titanium and prized for its Mohs hardness of 9. Explore its mineral science, treatment notes, historic... Read more...