Would be the species, neutral or ionized, indicated by its standard chemical image. Vacancies are denoted by V Certification: The existence of a credible gemological certification from a highly regarded and identified gem laboratory provides reliability and assurance to the quality of yellow sapphire or almost every other gemstone. Ceylon, https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share