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Consumers buying goods for diamonds both at B&M’s and with Internet venders are receiving conflicting and erroneous info in regards to the effects of fluorescence on a diamond’s visual appearance. The dispensed counsel takes the following forms: 1. Fluorescence (FL) is bad, stay away. 2. FL in lower color diamonds, e.g.; I-J-K is a positive in that it will make the diamond face up whiter but only if the FL is faint or Medium, not Strong. In higher colors (D-H) it is detrimental; stay away. 3. Strong FL is to be fended off at all costs. 4. FL diamonds need to be priced and sold at a discount relative to comparable carat weight, color/clarity-cut diamonds that are non-FL. Much of today’s buyer complex mental states and conduct in regards to FL may be traced back to the Diamond Industry’s sensing of FL. Briefly, a lot of diamond merchant’s would look for near-colorless to light yellow diamonds with strong blue FL because they believed that such FL imparted a more colorless aspect underneath lighting with a high UV content. In the late 70′s for the duration of the diamond “bren” when prices skyrocketed each day (analogous to the Tulip craze of the early 1800′s), galore diamantaires observed that a heap of gem diamonds with a very hazy aspect also fluoresced strong blue to UV radiation. These dealers started supplying significantly lower prices for these “Milky D’s (D color diamonds with very strong FL and scaled down transparency) and very strong FL also termed “overblues”. Gradually this sensed negative affect of FL disseminate downwards to partly include a broader color grades as far as F. In addition, with the substantial influx of Russian goods which integrate Med to Strong FL into the market, this sensed negative effect of FL has been exacerbated. Additional industry worries in regards to FL took on the following sensed factors: 1. Non-FL diamonds were thought to be more pure than FL stones, 2. Non-FL diamonds in the D-F color range were thought to be rarer than FL counterparts, and 3. The hazy aspect in the “overblues” must perhaps likewise subsist to a good deal of deleterious degree in weaker FL diamonds as well. A 1993 South Korean TV “expose” on FL purposed at buyers further served to spotlight these sensed negative distinct features of FL. Rapaport took these industry notions of FL one step further by codifying these artificially trade induced price differentials into his Rap pricing sheet, therefore the diamond ‘Bible’ had spoken and all say Amen, brother. The fact is that FL is not a negative in the diamonds; on the contrary it may be and is a very positive factor. Several of us in the trade have known and advocated this both in the trade. We do not price discount our Medium or Strong FL SuperbCert diamonds as there is no reason to. In 1997, GIA conducted an broad study on the effects of diamonf FL on visual perception. Consumers and tradespeople were both asked to valuate the effects of FL on their visual sensing and to note any significant distinctions amid non-FL to FL diamonds of differing FL intensities. The results of this GIA study were highly instructive and surprising. GIA found that non-trade observers ( akin to buyers buying goods at their B&M jewelers) could not make ANY significant distinctions among non-FL to the FL diamonds and that FL diamonds had no overall effect on the diamond’s color or transparency! For the experienced observers that encompassed tradespeople, the strength of FL had no substantial effect on the color appearence of the diamonds when viewed table-down (typical of lab grading). In the table-up position (which is the way buyers view the diamonds at B&M’s and diamond showrooms), diamonds that were described as strong FL or very strong FL were, on average, reported to have a better color aspect than less FL stones. Strong FL was reported to have little affect on sensed transparency of the diamonds. The link to this GIA study is here: http://www.gia.edu/pdfs/W97_fluoresce.pdf This is a very essential study and must be required reading for both buyers and all diamond and jewelry professionals. There are no grounds to consider FL in a negative light and accordingly no basis for price differentiation relative to non-FL diamonds. The Earth is not flat. |
