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Natural Diamond
A stone that emits blue fluorescence but shows no phosphorescence is natural.
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Moissonaite
Stones that are invisible under fluorescence light and show no phosphorescence are moissanite.
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Potential CVD Lab grown
Stones that emit any color other than blue fluorescence are potential CVD lab-grown diamonds. These stones may exhibit slight to high levels of phosphorescence.
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Lab Grown Diamond
A stone that emits powerful greenish fluorescence and exhibits a high level of phosphorescence is an HPHT lab-grown diamond.
Those stones are marked red to inform user
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Cubic Zirconia
Stones that exhibit low to no fluorescence and have greenish-brown reflections around the edges are simulants, such as cubic zirconia. These stones show no phosphorescence.