23.06.2015
In cooperation with Enzo Finger and Kjetil Falkum Lovik, Work in Progress was one of five design teams chosen to design a proposal for Norway’s new passport. Abstract: Decades after the establishment in the mid-twentieth century of ultraviolet-free illumination for colour grading a diamond, an examination of diamond trade and laboratory grading practices finds nearly everyone employing some type of fluorescent tube lighting containing significant ultraviolet. Tashey’s discovery is an example in a ‘Very-Strong-Blue’ fluorescing diamond of close to a four and a half grade colour improvement to high D in the DiamondLite from its unimproved colour grade of low H. Documented evidence of the over grading of blue fluorescent diamonds was present in a photograph in the paper “The effect of blue fluorescence on the appearance of diamonds.
The substantial face-up difference in for example the right most two diamonds is easier to compare in the combined image of the same upper-right halves of those two diamonds where the sizes of each half are matched while preserving the colour difference between the diamonds as they appeared in the Gems and Gemology article’s Figure 3. Combined image of two diamond halves showing the body color difference absent stimulation of fluorescence of a None (whiter lower left half) and a Strong Blue fluorescent diamond (darker upper right half), both having been graded the same I color in the DiamondLite.
Revealed in the photographer’s relatively UV-free lighting is the darker colour unenhanced by blue fluorescence of the three strongly fluorescing members of this I colour set. From GIA’s research study, this photography provides visual proof of the overgrading of these three diamonds relative to their colour unimproved by blue fluroescence. While the difference is apparent, the magnitude of over-grading relative to the colour unenhanced by fluorescence cannot be accurately determined from this photograph. BASED ELECTRONIC BALLEST CIRCUIT DIAGRAM AND DESIGN DETAILS I need a circuit diagram for electronic ballast (40w,230v) transistor based circuit diagram.


BASED ELECTRONIC BALLEST CIRCUIT DIAGRAM AND DESIGN DETAILS Really interesting posts here. Our online sales are temporarily suspended.Chalcedony Fluorescent Specimen This rock is the perfect addition to the UV-lover's collection. Our proposal focuses on the Norwegian journey, from the Viking saga to present times, depicting historical events involving people and places that shaped the nation.
This paper demonstrates and quantifies the over-grading of blue-fluorescent diamonds that often results. This large an improvement caused by blue fluorescense may be met with disbelief by professionals in the trade, all of whom grade in some form of UV-containing fluorescent illumination. That quantification of color difference was accomplished in this study by grading and analysis of the 25 diamond data base central to this investigation.
A pale pink with creme white color in natural light, this Chalcedony piece fluoresces bright green under the short wave UV lamp.
Simple methods are proposed that, by themselves or in combination, provide inexpensive and workable solutions to resolve this problem.
This compares to the over 170?W of grade whitening UV present within a 2 inch grading distance in the DiamondLite. Its alien green color is appropriate, as it comes from Moriarty, New Mexico, a short drive away from the famous Roswell, NM.


However, the data base in the current investigation contains a 0.63 ct marquise diamond with a similar four and a half grade improvement in the DiamondLite over its unimproved colour as determined in typical  artificial lighting.
Their Figure 3 includes a set of six diamonds graded I colour in the DiamondLite, which were said to differ only in their fluorescent strengths. This photograph affords an opportunity to see the relationship of the colour differences, apparent in the face-up diamond images, to their fluorescence strengths. The competition was initiated by the The Directorate of the Police and The National Criminal Investigation Service. Most forms of artificial light including that from fluorescent tubes overhead at a distance of two to three or more feet contain negligible UV at the diamond’s viewing position. These identically colour graded diamonds reproduced in Figure 2 show clear face-up colour differences. The diamond’s colour unimproved by blue fluorescense is seen and graded in this lighting. It is no coincidence that these more tinted diamonds are the three with the strongest blue fluorescence.



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