The different qualities of yellow sapphire are as follows: • Lowest quality yellow sapphire gemstone, whose origin is Bangkok (Thailand) which are highly treated and not effective at all,. This yellow sapphire is not recommended by Authentic Astrologers. • Medium quality yellow sapphire gemstone, whose origin is Bangkok (Thailand) Sri-Lanka which is moderately treated and effective also and can recommend by authentic Astrologers. • High-quality yellow sapphire gemstone, whose origin is Sri-Lanka, Burma which is not treated at all and this yellow sapphire is very effective and recommended by most Astrologers. • Very High/Rare quality yellow sapphire, whose origin is Sri-Lanka, Burma Brazil, is not treated at all. This Yellow Sapphire is most effective and highly recommended by every Astrologer.