ADAMAS GEMOLOGICAL LABORATORY publishes gemologically oriented software for the jewelry appraiser, jeweler, or student in gemology or mineralogy. The laboratory also provides technical consulting and jewelry appraisal services to the trade and the public and expert witness services to the legal profession.

SAS2000: Developed, Produced And Supported In The USA   Questions, Comments, Product Support

NEWS FLASH SAS2000 Inovations SO GOOD That DeBeers Tries To Steal Them

The SAS2000 combines a state of the art, dual channel fiber optic spectrophotometer with an approximate optical resolution of 1.5nm. Ask about the optical resolution of single channel , single purpose "Full Spectrum" colorimeters now being sold.

The SAS2000 quantifies the 400nm to 950nm band in approximately 0.3nm intervals, approximately 8 times finer than the next closest single purpose colorimeter.. The SAS2000 is a DUAL channel system, accurately tracking with the reference channel any variations in the illumination source spectra, in contrast to the single channel colorimeters.

Because of intellectual property copyright protection, no other system can legally offer the SAS2000's unique Diamond Quality Analysis reports, which show the transmittance spectra of the subject diamond along with the GIA certified diamond master stones transmittance spectra used as the scientific basis for color grade estimation.

The SAS2000 utilizes the processing power of your own computer system to tap the wealth of information available. Here we see Lee S. Davis of SENG Jewelers in Louisville, Kentucky testing a diamond on the SAS2000.  SAS2000 users such as Lee have greatly contributed to the composite knowledge base being developed and compiled for the SAS2000 user's group's benefit. SAS2000  updates and reference data files are distributed automatically to the user's group via zipped attachments to Internet Email.

The SAS2000 is a high resolution system which utilizes GIA/GTL graded diamond master stones for its color grading calibration and a numerical grading system (0-10) consistent with the AGS colorimeter scale reading, based on the 1950's Shipley Colorimeter. Figure 1 shows the diamond masters used for the initial SAS2000 system calibration. The user can add his masters to the system calibration to extend the color grading range of the system or create a completely separate calibration, for instance, using HRD masters instead of those graded by GIA, a recent software improvement.

.

Figure 1

Grading a diamond is a simple procedure which results in an estimated grade based on multiple mathematical comparisons from established color science theory as well as modeling of the visual grading process. Figure 2 illustrates a typical diamond grading result with adjacent master stone data shown for a consumer oriented visual comparison. No longer will the mystery of diamond color grading be relegated to "trust me...it's a G". This example clearly shows the diamond between an F/G master and a little better than an H/I master.

Figure 2

The SAS2000's simple, yet robust, system and software design eliminates the "firmware" limitations imposed by other systems. Avoid hardware obsolescence and hardware dumping. Beware of sexy packaging hiding limited capabilities. The SAS2000 is sold to you direct, eliminating reseller's margins which were not built into the price. Only the SAS2000 offers onsite setup and two days training, client pays travel expenses only. Only the SAS2000 offers custom software and reports at very reasonable prices.

The SAS2000 can uniquely compare sample transmittance data to the Munsell system
We have added a complete correlation of the National Bureau of Standards (NBS) Standardized Color Names with the CIE coordinates of all defined Munsell chip coordinates. The NBS color naming convention apparently was the basis for GIA's GTL fancy color diamond descriptions.

The SAS2000 will contain the data necessary to create a preliminary correlation with the new GIA/GTL Fancy Colored Diamond Grading system, which uses the Munsell Glossy Book Of Color as its reference. Shown in Figure 3 is the closest Munsell Matte Chip  Spectral Data to the average color characteristics of the fancy colored diamond.

Figure 3

The SAS2000 will eventually be your complete electronic color reference....

   If you are interested in the colormetrics The SAS2000 gives you both CIE and CIELAB displays showing the relationship of the current chromaticity coordinate to either color space.

The SAS2000 provides the visual correlation for detection of radiation induced color in diamonds.

The SAS2000 Spectrophotometer Analysis System has the high optical resolution needed to differentiate most fancy colored diamonds from their naturally colored counterparts. The exception are fancy greens which owe their color to natural radiation. Figures 4 illustrates the ease in which this separation can be made using the SAS2000.

Figure 4

The SAS2000 system software automatically warns you if it detects possible radiation damage at optical centers when analyzing fancy colored diamonds.

The SAS2000 Now Includes The Adamas Advantage Raytrace Analysis

The SAS2000 Is Used In Identifying Possible Synthetic Diamonds

De Beers has introduced a single purpose machine to the industry, called the DiamondSure, recently reviewed in Gems And Gemology, which differentiates between possible diamond synthetics and 95+% of naturals, which belong to the "Cape Series Diamond" which owe their color to Nitrogen. Transmittance spectra on synthetic near colorless diamond are consistent with that of "Brown Series" diamonds. Figure 5 shows that this separation is easily accomplished also with the SAS2000 Spectrophotometer Analysis System.

Figure 5

 More De Beer's Synthetic Diamond Data
 More Russian Colored Synthetic Diamonds

The SAS2000 functions as a spectroscope for gemstone evaluation and identification.

The SAS2000 is a high resolution spectroscope, with the ease and convenience of the video screen for viewing. The rare earth spectra shown in Figure 6 illustrates the usefulness of this system.

Figure 6

The SAS2000 warns you when it recognizes fluorescence in diamonds.

The SAS2000 has increasingly more artificial intelligence capabilities with each software upgrade released. The SAS2000 fluorescence checking system will pick up most fluorescence levels above moderate when the special filter is not in use. The SAS2000 incorporates this special UV blocking filter so that color grading can be done without blue fluorescence influencing the color grade.

Figure 7

The SAS2000 uses multiple color difference formulations to estimate diamond color grade. One of the problems in diamond color grading is that the separations in color space of diamond color grades are VERY compressed in the colorless to near colorless range. Figure 8 shows the chromaticity coordinates of the SAS2000 diamond masters, from E to O. Superimposed on this plot are the closest one sigma and three sigma MacAdam uncertainty ellipses.  The MacAdam ellipses are one of color sciences reference points, empirically derived through testing, estimating human repeatability in color matching, which is the essence of diamond color grading. The color science texts state that the "just noticeable difference was found to be about three times as large as the corresponding standard deviation", sometimes called the Discrimination Ellipse. In lay terms approximately 68% of the time, the human observer's color matching will fall  within the 1 sigma ellipse. As can be readily seen, the one sigma ellipse incorporates more than two color grades in the colorless to near colorless range. Of particular interest is that the 1 sigma MacAdam ellipse shown is both the closest, centered at [.305, .323 ] on the chromaticity diagram, and the smallest of the 25 ellipses within the CIE diagram. We should note also the 58 degree orientation of the ellipse, which corresponds almost exactly to the "hue angle" of the cape series masters.  Perhaps this is one of the reasons one finds so much discrepancy or variation with human color grading.
 

Figure 8

The SAS2000 includes The Adamas Advantage Accuplot plotting capabilities and state of the art Quality Analysis Report Generation ..  The SAS2000 is the ultimate tool for the gemologist - appraiser....

The SAS2000 requires an IBM compatible PC operating environment under Windows 98. We recommend a minimum 16meg RAM with a 1gigHz or above hardware processor. The SAS2000 requires one pcmcia card slot in your computer for the A/D converter card supplied with the system. An SVGA monitor with a minimum 1024 by 768 screen resolution is recommended as well as an Uninteruptable Power Supply (UPS) to protect your hard drive, as there can be considerable I/O activity when creating reports.

The SAS2000 is now standard with a PCMCIA controller to be used in conjunction with a laptop computer. We custom build an SAS2000 into a ZERO Haliburton case for more portability. The SAS2000 can be made available with a external fiber optic probe for reflectance spectroscopy. As the SAS2000 is custom built for you, to your requirements, please call 617-232-5508 for current pricing, availability for your configuartion. Non continental USA units will only be built in a portable configuration, and require a laptop computer, either supplied in advance by the client or supplied by Adamas. Because of additional travel requirements for non continental USA setup and integration, these units will surcharge to reflect additional time and costs. Pricing includes onsite setup, two days training, one year warranty and one year of free system software upgrades via the SAS2000 WebSite. Custom reports are available at reasonable rates.