Could be the species, neutral or ionized, indicated by its typical chemical symbol. Vacancies are denoted by V Certification: The presence of a reputable gemological certification from a respected and recognized gem laboratory adds reliability and assurance to the caliber of yellow sapphire or any other gemstone. The information of https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share