While purchasing the yellow sapphire gemstone the color, clarity, cut, and carat weight of the stone should be considered. The stone should be a medium to deep yellow color with no brown or green cast. Transparency is essential; ensure that you choose one that does not have any inclusions that you can see without a loupe. The cut should be such that it will make the entire face of the stone as well as the back look smooth and brilliant with equal distribution of the light. Depending on your need, carat weight might be chosen according to your pocket and need, opting for size and quality simultaneously. As much as possible, buy from a trusted supplier, and request for paperwork from a reputable gemological laboratory to know whether or not the gemstone is natural. Check if any treatments have been done on the stone.