The diamond simulant should pass the window panel test. By using the stones for another jewelry piece grandma's memory will be with you every time you wear it. They will be able to tell you all about the stones that are in the jewelry.
Explanation of Cut, Color and Clarity of This Diamond
Cut Quality Diamonds with good cut still have very good proportions and will reflect large percentage of incoming light. Good cut diamonds still have excellent brilliance and fire. This grade represents an excellent balance between quality and price.
Color Color grade I is in the middle of the near colorless category. Typically a trained professional will be able to discern the presence of color. Some people prefer warmer colors like I. When I color diamond is set in yellow gold jewelry used with yellow gold bezel, the diamond will appear as gorgeous as any of the higher graded stones.
Clarity VS1 clarity diamonds are very slightly included grade one. VS1 diamonds are less expensive than the VVS1 or VVS2 grades and present an excellent value. They have minor inclusions that are bigger and more noticeable than in higher clarity grades, but they are only visible at 10x magnification. To the naked eye, these diamonds will appear unblemished.