The salesperson usually offers to view the diamond ring through a magnifier loupe employed at diamond ring stores, so that you can understand its qualities. However, an unskilled person cannot know if there are any flaws in a gemstone using such an equipment. So, it will be better to ask them for a gem microscope with at least 10x resolution that will give you a clear idea about the inclusions in a diamond.
Another crucial thing when buying amazing diamond rings is to choose a credible jewelry shop. It will be better if the gemstones in that diamond ring store were graded by independent professionals rather than the gemologists employed in the store. Additionally, make sure that your diamonds rings come with a GIA or AGS certificate.