The DiamondPlus is a compact screening device intended for use in all locations where polished diamonds are handled.
It is primarily designed to screen for Type II high pressure high temperature (HPHT) treated natural diamonds, although it does also have the capability to separate out some synthetic categories and will refer some irradiated diamonds.
The instrument is designed to make a measurement with the sample immersed in liquid nitrogen and therefore is only suitable for testing loose stones in the ~0.05ct to 10ct size range.
The instrument makes a laser-excited photoluminescence measurement and will return an automated pass or refer result. Diamonds referred by the instrument should not be classified as HPHT treated or synthetic without additional testing.
In addition to referring all HPHT treated Type II diamonds, the instrument will also refer a percentage of untreated natural Type II diamonds. Testing on all referred diamonds should be carried out using more sensitive, laboratory-based, low temperature photoluminescence equipment. From these measurements, a definitive decision can be made on the origin of the stones.
The DiamondPlus performs best on high colour Type II diamonds and the referral rate may increase as the strength of the brown colour increases.
DiamondPlus is approximately 15cm(w), 26cm(d) and 10cm(h).
The DiamondPlus requires the liquid nitrogen to cool the sample sufficiently so that any features present in the PL spectrum are sharpened and therefore more easily analysed.
This instrument is ideally suited to a laboratory environment.
This message may be displayed if the table of the diamond under test is not in contact with the fibre optic probe. Ensure the stone is securely attached to the holder before immersion in the liquid nitrogen.
It can sometimes take a few seconds for large stones to reach the correct temperature. Try to wait a few seconds after immersion before making a measurement.
The numbers relate to the properties of the features within the photoluminescence spectrum recorded by DiamondPlus.