It was always hard for me to find the best present for my dad, so I, unfortunately, I can't help you here. Think about what he likes, and buy something according to his preferences. What about a present for your mother, then I believe that piece of jewelry will be a good idea. And if you want to make it more unusual, grade the gem and give her also a grading certificate. Such a necessary procedure such a diamond grading is not that popular as it should have been. It's an excellent way to protect yourself from fake stones and discover your gem's unique character. Gemological Science International is a famous gemological laboratory where you can grade your diamond and get gemological certification with accurate grading results. Besides, you'll find out the precise value of your stone.