Depending on the location and the depth of the scratch, yes and no.
Take your stone to a local jeweler and ask for advice about polishing out the scratch. If it's superficial and shallow, the jeweler may be able to polish out the scratch.
If, however, the scratch is visible and deep, the stone may have to be re-cut in order to give it a value, and the new value of the smaller stone may be less than its original value.
A diamond can scratch a diamond, but one diamond cannot scratch itself.
No. Only a diamond can scratch another diamond.
Nope! A diamond is the hardest substance on earth so only a diamond can scratch a diamond!
Yes: not a good use for a diamond, but yes, a diamond will scratch a nail.
Yes, in fact, it is the only way to scratch a diamond.
Diamond is harder than steel: you can scratch steel with a diamond, but steel will not scratch a diamond.
noNo other way around
Diamond will scratch everything, including diamond.
Diamond
A diamond can only be scratched by another diamond due to its hardness. No other material is hard enough to scratch a diamond.
The field test for diamond is 'extreme hardness'. If you believe that you've found a diamond stone, you can take it to a jeweler, who will apply a probe and verify your find as a diamond stone, or not.
No, gypsum cannot scratch diamond. Diamond is the hardest mineral on the Mohs scale with a rating of 10, while gypsum is much softer with a rating of 2, which means diamond is able to scratch gypsum but not the other way around.