With their unusual cut, it’s important to look at a few different areas for a ‘quality’ loose marquise diamond.
Be sure to look at a diamond in neutral videos or in real-life to assess the quality. Though inclusions can be midden well within the many facets, you also need to consider the way the light hits the centre of the elongated diamond.
If the cut is of poorer quality, it can create a ‘bow-tie’ effect caused by even distribution of light throughout the stone. This is where the central facets don’t reflect light and create dark patches horizontally across the diamond, in a bow-tie shape. In order to see if a stone has the bow-tie effect, look at the diamond face on, at a 90-degree angle.
Like other fancy cuts of diamond, loose diamond marquise cuts will show their colour more. To find a ‘good quality’ marquise that has an icy white look, be sure to inspect the pointed tips as the colour is more concentrated there.