When it comes to choosing the best quality Yellow Sapphire gemstone, there are several factors to consider. First and foremost, it is important to ensure that the gemstone has not been treated with high temperatures. Yellow Sapphires that have not undergone extreme heat treatment hold a higher value, as they naturally exhibit internal feathers. Harsh treatment destroys these feathers, and a trained gemologist can easily identify such damage.

Next, pay attention to the clarity of the gemstone. Authentic Yellow Sapphires have a low refractive index and display high clarity. This is an important characteristic to verify the gemstone's authenticity.

Additionally, inspect the gemstone for any bubbles or inclusions. Natural Yellow Sapphires do not have any bubbles inside, which can be easily observed with the naked eye. The presence of bubbles indicates a fake gemstone.

Consider the carat weight of the Yellow Sapphire. A medium-sized 1-carat Yellow Sapphire typically exhibits a well-defined canary yellow color, with proper cuts and clarity. Gemstones below 1 carat often have a lighter yellow hue.

Lastly, pay attention to the cuts of the gemstone. Different types of cuts can enhance the appearance of Yellow Sapphires, and customized jewelry with unique cuts is increasingly popular.

By considering these factors of treatment, clarity, bubbles, carat weight, and cuts, you can make an informed decision and choose the best quality Yellow Sapphire gemstone for your needs.