Yellow Sapphire stands nine on the hardness scale Keeping the third posture just after Diamond and Moissanite. In case the gemstone is more than one carat then it could't have sleek edges. Colour: As the purest Variation from the household of sapphires, these white gems are generally of the best https://www.apsense.com/article/810029-some-historical-facts-about-sri-lankan-yellow-sapp.html