Garry Holloway1 was the first to suggest a meaningful explanation for this: he suggested that, because there is a small difference between pavilion main & half facet slopes (less than 2º in a typical round brilliant), this may cause one to be dark when the other is bright – producing contrast in the gem’s image. Studies of human optical response2 say that this is attractive to viewers; it may be why the people Tolkowsky polled chose the proportions they did.
The purpose of this article is to examine the role of designer brands in the overall bridal jewelry market, to understand how they operate, and to compare and contrast their offerings with “generic” or non-branded jewelry. The intent is to help consumers understand the designer value proposition in order to make well informed buying decisions. In the course of talking about designer jewelry in general we will look at several individual designers and explore a bit of their history and their distinguishing characteristics.
Diamond clarity grading involves assessing how readily visible the inclusions are in a diamond and accounting for an extensive list of potential variables including the size, number, type, location, and relief of its inclusions. At the American Gem Society Laboratories (AGSL), clarity grading begins once color grading is completed.
I get questions about this often and thought I would present something of an answer. Simulants are a different thing, and most of them ARE pretty cheap, but colorless and near-colorless lab-grown diamonds are pretty close to the prices of their natural counterparts. This often comes as a surprise, because people have seen or read things to the contrary, and because the whole synthetic gemstone business has precedents.