Jadeite Jade Certificate
GCS Jadeite Jade Certificate is a comprehensive scientific document that includes all the relevant information on the Jadeite Jade. It contains the detailed description of the tested Jadeite Jade and the testing results with one of the conclusive data as interpreted by FTIR, UV VIS, RAMAN and XRF spectrophototmeters. A color photograph of the tested Jadeite Jade is also provided. Its conclusion discloses identification and treatment.
Classes of Jadeite
- A-Jade refers to natural hard Feicui with high density.
- B-Jade refers to Jadeite (Feicui) which undergoes chemical treatment and is injected with resin. Its natural structure has been destroyed or changed, though its color remains natural without dying.
- C-Jade refers to Jadeite which undergoes a dyeing process to gain a better color.
- B+C-Jade will undergo chemical treatment, be injected with resin, and dyed. Its natural structure will either be changed or destroyed.
Counterfait of Jadeite
Imitations which have a Jadeite-like look and are actually taken as Jadeite, are called counterfeit Jadeite. Counterfeit Jadeite can be made out of either natural or synthetic gemstones. Counterfeit Jadeite that is made from natural gemstones can be seen in Chrysoprase, Dyed quartz or Aventurine Jade. Synthetic counterfeit Jadeite can be made from plastic goods or dyed glass.
The test result includes information about the kind of amber used (Baltic, Mexican, Dominican, etc.). The amber’s place of origin is not stated. The notes include information about any performed treatment (heating, tinting, coating) or reconstruction (pressing). Genuine Baltic Amber, i.e. succinite is becoming ever more expensive and its prestige is constantly growing. It is more and more important that the purchase of amber jewellery comes with absolute certainty about the amber’s authenticity. FTIR spectroscopy may provide clues to the natural, copal or treated Amber.
Once it has been established that an item is coral, several tests may be conducted to determine if its pink-to-red color is natural or dyed. The visual appearance of the coral may provide an indication of the origin of color, but such observations should not be considered conclusive. Additionally, although microscopic examination alone can prove the pres- ence of dye in color-treated coral (through concentrations of color in surface pits, cavities, or fractures), the lack of such features is insufficient to prove that the color of a specimen is natural. Raman and Photoluminescence Spectroscopy identifies the biogenic calcium carbonate phase of the skeleton (CaCO3). UV-Vis-NIR reflectance spectroscopy may provide clues to the natural or dyed condition of a piece of coral.