You really need to do this if your diamond is set in soft metals such as 24 karat gold. You should rub any dirt off using a jewelry cloth, not fingernails. Silver-dip is another commonly used sterling silver jewelry cleaner, which can also be obtained from jewelry store.
Explanation of Cut, Color and Clarity of This Diamond
Cut Quality Diamonds cut to ideal proportions are made to reflect the most amount of light. This results in a display of brilliance and fire, thereby placing ideal-cut diamonds higher on the quality pyramid than deep or shallow-cut diamonds. Ideal cut diamonds have most intense brilliance of all diamond cuts.
Color Diamonds of D color are absolutely colorless. It is the top most color grade and only 0.3% of all diamonds that make it out of the earth being D color.
Clarity SI1 clarity diamonds are slightly included. SI1 diamonds have some inclusions visible under 10x magnification but not easily visible to the naked eye. A diamond with this grade of clarity is an excellent choice for someone on a limited budget.