XexLift   would find a clarity enhanced diamond in your grandmother's diamond ring. This process relies on the use of lasers and high tech materials that would not have been available when your grandmother got engaged. The one person who is credited with commercially producing a clarity enhanced diamond is Zvi Yehuda. His company is still involved in improving the clarity of diamonds and they have been working on improving the process over the years. How is it done? Clarity enhanced diamonds fall into one  https://www.bluesupplement.com/xexlift/