The first difference. We know that diamond has one of the biggest bright spots, that is, its hardness, the Mohs hardness of diamond is 10, and the Mohs hardness of zircon is between 6-7, so we can use their hardness difference to distinguish. Look for a gemstone with a hardness in the middle of it. Draw on the diamond and zircon table. If it is a diamond, then there will be no trace on the table; if it is zircon, then I am sorry, the table is scratched.
Second, we use the perspective effect to distinguish between diamond and zircon. we get a piece of paper with black lines, and place the diamond and zircon countertops (note: countertops) with the bottom line pointing up with black lines. If it is a diamond, you can't see it. The black line on the paper, because the cut of the diamond is usually standard, almost no light can be faceted through the pavilion, so the black line on the paper will not be visible (except in one case: unless the diamond is cut Improper grinding). This method actually uses the principle of the refractive index of the gemstone. The higher the refractive index, the less easy it is to see through. Therefore, since zircon has a lower refractive index than diamond, it is easier to see through than diamond. However, because this method is only suitable for round-drilling cuts, other cuts are not applicable, and if the diamond is stained with liquid, it will be visible, so personal advice can not blindly believe this method, but also need to combine other Method test is required.
The above are two simple methods to tell the difference between cubic zirconia and diamond