This 4.2 carat natural Blue Sapphire is a fine over-4-carat gemstone with a rich, consistent blue color and natural corundum luster, ideal for premium astrological gemstone therapy and high-end jewelry design. As a large Neelam Ratna, it holds exceptional astrological power in Vedic astrology for Saturn, offering the most potent Shani energy for career success, mental discipline, and financial prosperity. Best set in gold or platinum for a powerful astrological ring or a luxury statement pendant.