Accredited Analysis Reports for Reliable Gem Expertise
The full analysis and report highlighting opals unset or set on jewellery.
The full report
Features
-
N° 00000
SPECIMEN - Paris, xx/xx/xxxx
Date
The date corresponds to the end of the analyses and the day on which the report is published.
- Object
Object
The object specifies whether we have received a single stone, a batch or a jewel, and the type of jewel.
- Shape - Cut
- Oval - Cabochon
Shape - Cut
The shape, cut and measurements describe the external appearance of the stone. When you deposit a jewel with several stones, or batches, we note the diametrical variation of the batch.
- Measurements
- 18.11 x 14.19 x 8.24 mm
Measurements
The shape, cut and measurements describe the external appearance of the stone. When you deposit a jewel with several stones, or batches, we note the diametrical variation of the batch.
- Mass
- 13.19 ct
Mass
The weight of the stones is indicated in carats (1ct = 0.2 g) to two decimal places.
Rounding is done according to the 3rd decimal place: if it is less than 9 then no rounding, if it is equal to 9 then round up. For example: 0.9990 ct is 1.00 carat but 0.9989 ct is 0.99 carat.
If the jewel is set with stones, it is weighed in grams.
- Mass colour
- N3
Mass colour
The colour gives an indication of the colour in the mass and the diffraction colours.
Find out more about colour designation
- Play of colour
- Mainly blue to green
- Comment(s)
Scientific instruments used
- Mass measurement
- Normalised lighting
- Infrared spectrometer (FTIR)
- Measurer
- Ultraviolet lamps
- Raman spectrometer
- Photography device
- Microscope
- EDXRF Spectrometer
Identification
BLACK OPAL (NATURAL OPAL)
Treatments
N - No indication of treatments
Geographic origin
The geographical origin indicated is an opinion of the Laboratory based on gemmological data (spectra, chemistry, inclusions).
Australia
Photography
The colour and dimensions of the object analysed are approximate.
Colours divided into areas with undefined contours
Numerous parallel polysynthetic macles, sometimes described as ‘straw’ patterns