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.

RUSSIAN SYNTHETIC DIAMOND SPECTRA

SAS2000: Developed, Produced And Supported In The USA   Questions, Comments, Product Support
Adamas Gemological Laboratory is proud to introduce to the industry the custom built SAS2000Spectrophotometer Analysis System for diamond and gemstone evaluation and grading. The SAS2000 provides the most accurate colorimetry available today for diamond color grading, helps determine radiation treatments of diamond, provides better ability than the DeBeer's DiamondSure to detect probable  synthetic diamonds , and replaces the spectroscope for transparent gemstone evaluation.

LUCENT DIAMONDS HPHT REDS
Tucson 2001

We just took spectra on Lucent Diamonds new vibrant RED and YELLOW synthetic diamonds, courtesy of Alex Grizenko. You will not have trouble identifing these diamonds because of their UNIQUE long and short wave fluorescent character shown below.

RED 4700 Kelvin Illumination             RED LW Illumination                  RED SW Illumination

Russian Patent Application posted 12/11/04
METHOD OF MANUFACTURING DIAMONDS IN FANTASY RED COLOR
 
  Bibliographic data     Description     Claims     Mosaics     Original document     INPADOC legal status
 
 
  Patent number: RU2237113
Publication date: 2004-09-27
Inventor: VINS V G (RU)
Applicant:
Classification:
- international: C30B33/04; C30B33/02; C30B29/04; C01B31/06
- european:
Application number: RU20030119470 20030626
Priority number(s): RU20030119470 20030626
 
 
 
 Abstract of RU2237113
 

FIELD: carbon materials. 
SUBSTANCE: invention relates to treatment (refinement) of diamonds to impart them a variety colors, which may find use in jeweller's art. Method consists in that, in crystalline lattice of naturally occurring type IA diamond containing A defects or naturally occurring high-nitrogen type IA diamond containing more than 800 ppm nitrogen impurities in the form of A and B1 defects, individual nitrogen atoms in substitution position (C defects) are formed. Naturally occurring type IA diamond containing A defects is annealed in high-pressure apparatus at temperature above 2150 and stabilization pressure 6.0-7.0 GPa and then exposed to electron beam 5 x 1015 - 5 x 1018 cm-2 at 2-4 MeV, after which subjected to annealing in vacuo at temperature at least 1100. Naturally occurring high-nitrogen type IA diamond containing more than 800 ppm nitrogen impurities in the form of A and B1 defects is exposed to high-energy electron beam at radiation dose 1019 cm-2, after which subjected to annealing in vacuo at temperature at least 1100. Products are diamonds in fantasy red color appropriate for brilliants with stable N-V coloration sites absorbing within wavelength range 400-640 nm. 
EFFECT: expanded diamond refinement possibilities.
 
 
 
 
 
 
 

SYNTHETIC HPHT YELLOW

Yellow 4700 Kelvin Illumination          Yellow LW Illumination           Yellow SW Illumination

The yellow had some red zones in short wave illumination


 

SYNTHETIC HPHT PINK


 

RUSSIAN SYNTHETIC DATA
RED DIAMOND (2000 Data)

Alex  Grizenko of Lucent Diamonds in Bolder, Colorado kindly supplied a 1.02 ct full cut round brilliant synthetic red diamond, shown below.  SAS2000 spectrophotometry automatically detected the Ni cayalysts synthetic with detections at 617, 638 and 658nm (dotted lines), charateristics of Ni catalyst production. Annealed radiation damage is evident by a weak response (not automatically detected) at 741nm as well as 638nm. When illuminated through the table with fiberoptic the diamond exhibited a yellowish orange core (characteristic of yellowish brown Ni catalyst synthetics typically seen) with an approximately 1.5mm rich red colored rim.  This "rim" suggests to the author of the dose depth characteristic of electron irradiation, but this is not confirmed. It appears that the 741 general radiation line has allmost completely been annealed out.  I cannot find a reference in the literature to the major wide band absorption centered at 701nm, however Ni catalyst lines at 710.7 and 690.9nm are referenced.


 
 

ORANGY BROWN

 SAS2000 Spectrophotometer   Questions, Comments, Product Support AD