The beauty of a pearl lies in its characteristic luster, which is also the value factor with the greatest impact, than the other, on the beauty of a pearl.
The sheen is more than just a superficial luster; it is due to the light that penetrates through the various layers of translucent nacre and returns the observer’s eye from the inner depths of the gem. The effect is that of a glow coming from within, from the heart of the pearl.
Usually pearls owning a layer nacre very thin looks opaque appearance and dull, but the thickness is not the only factor that determines the brightness. The degree of transparency and the provision of platelets that make up the overlapped nacre are factors affecting conspicuously on the gloss of pearl.
Even the growth conditions can affect the gloss. The faster the nacre is produced, the lower its transparency and, accordingly, the pearl could present a lower gloss (despite having a considerable layer of nacre). The luster of pearls is grouped into four categories: – excellent (striking): reflections are bright, very sharp and clearly defined; – good: reflections are bright but not sharp, slightly clouded at the ends; – fair: reflections are weak, confused and blurred; – poor: reflections are very indistinct and disseminated. The luster is the factor that makes it unique and distinguishes the pearls when compared to other gems. But not all the pearls have a fairly good degree of shine. The beads that have a low degree of gloss are much less valuable than those which have a high gloss.
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