Of all the navaratna, the Blue Sapphire (Neelam) demands the most respect — and the most caution. Saturn is the planet of karma, discipline, and consequence, and his stone amplifies whatever is already present in the chart.
For those with well-placed Saturn — primarily Libra and Taurus ascendants — the Neelam can bring extraordinary focus, discipline, and professional achievement.
For others, it should not be worn without the specific guidance of a learned astrologer. This is not superstition; it is the accumulated observation of generations of practitioners.