SSEF diamond spotter™ and

SSEF illuminator™

  •                                                  The SSEF diamond spotter™ is a small device best to be used with the SSEF diamond illuminator™,
  •                                                   a powerful shortwave ultraviolet light source (SWUV).
  • The complete package consists of:

    SSEF diamond spotter                                                                        SSEF illuminator

                                       

                                 Important note:                                                                                                     

    The SSEF diamond spotter may only be used with the SSEF illuminator and the SWUV protection glasses.

    SWUV protection glasses

    Principle of the SSEF diamond spotter™

    You are testing the shortwave ultraviolet (SWUV) transparency of diamonds.

     

    - Diamonds of Type IaA and IaAB are absorbing SWUV light.

      Most diamonds are of this type (Cape) - Diamonds of Type Ib are absorbing SWUV light. They belong to the Canary series.

    - Diamonds of Type IIa and IIb are transmitting SWUV light.

    - Diamonds of Type IaB are transmitting SWUV light. Diamonds of this type are very rare.

     

     

    UV-VIS absorption spectra of type Ia and type IIa diamonds. The SSEF illuminator uses the shortwave emission at 254 nm (vertical dotted line) for separating diamonds of type Ia from diamonds of type IIa.

     

    Which stones may be tested with the SSEF diamond spotter™?

    You may test all diamonds with the SSEF diamond spotter. Be it colourless or coloured, cut or rough crystal, loose or mounted. Even diamonds which are larger than the sample holder of the spotter may be tested. It is important, however, that each time the diamond is well fixed with BluTack on the spotter to avoid passing of any stray light beside of the diamond.

    Copyright is at © SSEF Swiss Gemmological Institute.

                                                                              

    When a diamond is mounted, you may not be able to place the spotter with the fixed diamond downwards on the SSEF illuminator. Due to the high intensity of the SWUV radiation of the illuminator, it is still possible to observe a reaction (i.e. green spot) on the fluorescence screen of the spotter, even if it is hold in some centimeters distance from the SWUV source.

     

     

    How to use the SSEF diamond spotter,step-by-step

    Step 1

    The diamond has to be fixed with BluTack (plastic mass) in the sample holder (above the small hole on the top of the spotter).

    A brilliant cut diamond should be placed with the girdle ahead in the spotter to ensure optimum SWUV transmission.

    Step 2

    IMPORTANT:

    Close free space around the diamond tightly with BluTack to avoid passing of any stray light beside of the diamond.

    Step 3

    NEVER TOUCH THE SMALL WHITE SCREEN IN THE SPOTTER !

    It will be damaged because of its powdery consistence.

    Step 4

    Place the spotter with the fixed diamond downwards on the SSEF illuminator and switch on the SWUV light.

    WARNING:

    SWUV radiation is hazardous for your eyes and skin. The SSEF diamond spotter may only be used with the SSEF illuminator and the SWUV protection glasses. Do not use any other SWUV light source than the SSEF illuminator.

    Step 5

    Diamond testing with the SSEF diamond spotter™ should be done in a dark room in order to see a clear response.

    Step 6

    Two possible reactions when viewing through the the hole onto the screen:

    First possibility (Group A diamonds):no green fluorescence on the screen in the spotter:

    diamond absorbs SWUV, thus diamond is of type Ia or Ib

    Second possibility (Group B diamonds):green fluorescence spot on the screen in the spotter:

    diamond transmits SWUV, thus diamond is of type IIa or IIb (or rare type IaB)

    If no stone is placed in the spotter, a bright green spot results on the screen when SWUV is switched on.

    Step 7

    Wait until the red light extinguishes on the illuminator. This indicates, that the SWUV light has automatically switched off after one minute.

    You may now take out the diamond from the spotter.For more details, see also the free CD-ROM!

    Copyright is at © SSEF Swiss Gemmological Institute.

     

    Why testing diamonds with the SSEF diamond spotter™?

    Type II diamonds are found as colourless (type IIa), pink (IIa), blue (IIb) or brown (IIa and IIb) stones. Colourless, pink or blue stones may be naturally coloured or the result of a High Pressure High Temperature treatment (HPHT).

    The SSEF diamond spotter initially has been developed as a reaction to the threat of the HPHT treated diamonds (ie. GE POL, Monarch™, Bellataire™).

    The SSEF diamond spotter allows an easy separation into two groups of diamonds (see step 6 in the above section !)

    Group A: type IaA, IaAB and Ib

    Such colourless diamonds have not been decolorised by a HPHT treatment.

    Group B: type IIa, IIb and rare IaB

    Such diamonds may have been treated by a HPHT treatment.

    However, the SSEF diamond spotter does not determine, whether a diamond has been HPHT treated or not.

     

    What do you get after testing with the SSEF diamond spotter™?

    Colourless diamond:

    If no green spot is seen on the screen during testing with the SSEF diamond spotter, the colourless diamond belongs to group A (type IaA, IaAB or Ib) and has not been decolorised by a HPHT treatment.

    If a green spot is seen on the screen during testing with the SSEF diamond spotter, the colourless diamond belongs to group B (type IIa) and may have been decolorised by a HPHT treatment.

    In such a case, the diamond should be further analysed in a specialised gem laboratory (e.g. SSEF) where detection of HPHT treated diamonds is offered as a routine service.

     

    Pink or blue diamond:

    If no green spot is seen on the screen during testing with the SSEF diamond spotter, the pink or blue diamond belongs to group A and may have been treated by an irradiation and subsequent annealing.

    If a green spot is seen on the screen during testing with the SSEF diamond spotter, the pink or blue diamond is of type IIa (pink) or IIb (blue) and may have been colour improved by a HPHT treatment from an originally brownish diamond.

    In both cases, the diamond should be further analysed in a specialised gem laboratory (e.g. SSEF) where detection of irradiated or HPHT treated diamonds is offered as a routine service.

    Brown diamond:

    If no green spot is seen on the screen during testing with the SSEF diamond spotter, the brown diamond belongs to group A (type IaA, IaAB or Ib) and will not been decolorised by a HPHT treatment. In contrary, it will become greenish-yellow after such a HPHT treatment

    If a green spot is seen on the screen during testing with the SSEF diamond spotter, the brown diamond may possibly be decolorised by a HPHT treatment and become a colourless, pink or blue diamond.

    Diamond imitations:

    Cubic zirconia and synthetic moissanite both will absorb SWUV similar to diamonds of type IaA, IaAB and Ib (Group A). No green spot will be visible when testing such diamond imitations with the spotter.

    Synthetic colourless corundum transmits SWUV radiation. You will see a green spot on the screen of the spotter.Natural colourless corundum absorbs SWUV radiation. There will no green spot on the screen of the spotter when testing this stone.

     

    How to order the SSEF diamond Spotter™ and the SSEF Illuminator™?

     

    The SSEF diamond spotter and the SSEF illuminator (with adapter and voltage converter) are produced by SSEF Swiss Gemmological Institute. They are sold as a package together with SWUV protection glasses and a free CD-ROM.

    For prices and further information, please contact SSEF:

    SSEF Swiss Gemmological Institute,

    Falknerstrasse 9, CH - 4001 Basel, Switzerland

    tel: ++ 41 (0)61 262 06 40

    fax: ++41 (0)61 262 06 41

    e-mail gemlab@ssef.ch

    website www.ssef.ch

     

    in Israel, contact:

    D.Kamhi Ltd.

    Lilach Diamond Equipment

    Diamond Exchange Center Ramat -Gan

    for orders & information:

    fax. +972 3 7525754

    e-mail: david@dkamhi.com

    website: http://www.dkamchi.com

     

    Copyright is at © SSEF Swiss Gemmological Institute.