No
The highest rating given to a top quality diamond is D-Flawless.
Color is graded on a scale of D to Z, D being colorless, Z being the darkest shade of light yellow attributed to the scale. The closer to D on the scale, the more valuable the diamond. Clarity is rated between Flawless (FL) / Internally Flawless (IF) all the way to three levels of Imperfect I1, I2, and I3. Flawless it the most prized. Pink diamonds are becoming popular in the current market, where yellow diamonds or clear diamonds were once prized. See the Related Link for more extended information about the rating system and value placed on diamonds.
The highest grade of diamond falls into four categories:Clarity -- Flawless or Internally Flawless.Colour -- "D" colourless, or Intense Vivid Fancy for a coloured stone.Cut -- since the cut is determined by the previous categories, if the stone is of the highest rating for those, then the cut must be near perfect.Carat weight -- This is determined by all three preceding categories and the goal is to make it as high/ heavy as possible.
AAA clarity is not a recognized rating for diamonds. The standard clarity scale for diamonds ranges from Flawless (no inclusions) to Included (visible inclusions). AAA is not a term used in the diamond industry to describe clarity.
a star is a luminous pointed figure that shows up at night. A diamond rating is facts and information, cut, clarity, color, and more things on an diamond.
No one can judge 'good' for you: that's a personal decision. F colour on a diamond is toward the high-end of the desirable colour scale -- D colour being the highest grade in that category. SI1 means that there is one Significant Inclusion in the stone -- Flawless or Internally Flawless being the highest grade in the clarity category. You do not indicate the carat weight or the cut, both of which will help you evaluate 'good' on your own scale. For an investment-quality diamond, unless the stone is more than about three carats, its clarity rating can diminish its value. Buying this diamond from a retailer may mean that you will never recover your original cost, since diamond retailers usually mark up diamonds in the 300% range.
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.
Near colorless
Carat is the unit of measure for diamond weight. Karat rating may be appropriate for gold and its level of purity.
Cubic zirconia (CZ) is the cubic crystalline form of zirconium dioxide (ZrO2). The synthesized material is hard, optically flawless and usually colorless, but may be made in a variety of different colors. Hardness: cubic zirconia has a rating of approximately 8 on Mohs hardness scale vs. a rating of 10 for diamond. cubic zirconia gemstones may be cut differently from diamonds. The facet edges can be rounded or "smooth". Source: Wikipedia
Diamond is the hardest natural mineral, rated as 10 on the Mohs Scale of hardness, the top rating.
No. Diamond is the hardest natural mineral known, with a Mohs Scale rating of 10, the highest rating. Amethyst rates seven. You can read more about the Mohs Scale, below.