Type E not applicable
The AIGS Rarity Rating provides additional information regarding the itemâ€™s scarcity
at the time of the reportâ€™s publication. Due to the varying supply of the various
varieties of jade over time, this scale is constantly shifting to take into account
the ongoing depletion of existing sources and occasional discoveries of new deposits.
However, to date, northern Myanmar remains the worldâ€™s only commercially signicant
source of jadeite:
Extremely Rare (RRR): Items so rare that only a few are known to
Very Rare (RR): Items that AIGS would expect to encounter perhaps
just once per year.
Rare (R): Items that AIGS would expect to encounter around once
From the above descriptions, it can be clearly inferred that the vast majority of
tested items will not register on the AIGS Rarity Rating scale.
Jade refers to either one of two entirely distinct minerals with diering
chemical compositions - jadeite or nephrite. Jadeite belongs to the
pyroxene group of minerals, while nephrite is classied as an amphibole.
Because of its high value, jadeite is often enhanced in order to improve its appearance,
and thus increase both the value and saleability of the material. There are three
categories used to represent the extent to which these enhancements have been applied:
Jadeite for which there is no evidence of any articial enhancement beyond the traditional
and expected practices of cutting and polishing.
Jadeite for which there is evidence of previous bleaching with acids in order to
remove dark patches of iron-based compounds from the original material. This process
usually damages the jadeiteâ€™s structure and thus requires subsequent impregnation
with organic polymers in order to re-stabilize the material.
Jadeite for which there is evidence of articial color enhancement, usually in the
form of surface dyes.
Material that has been bleached, polymer-impregnated and dyed is known as B+C-Jade.
The jadeiteâ€™s fundamental variety is the most important factor to consider when
determining its grade and value. While this categorization is usually derived from
the stoneâ€™s body color(s), transparency is also occasionally used as the key variety-determining
Imperial / Old Mine: Imperial refers to the prized bright green hue, while
Old Mine indicates a ne texture.
Grand Royal Green: Similar to Imperial, but with a tinge
of gray or brown and slightly lower transparency.
Royal Green: Similar to Grand Royal, but with more secondary
coloration and yet lower levels of transparency.
Apple / Grassy Green: More yellowish and lighter in tone
than the imperial green hue.
Spinach Green: Variety with a green hue that is somewhat
darker in tone.
Pea Green: Grayish green hue with low levels of transparency.
Lavender: Light, grayish purple hue that represents the
most valuable of the non-green varieties.
Icy / Glass(y): High-transparency, colorless variety.
Moss-in-Snow: Well-known, bi-colored variety with bright
green patches against a white background.
The AIGS Master Jade Report also represents jadeiteâ€™s four other key quality-determining
factors: (i) color, (ii) transparency, (iii) shape and (iv)
1: Color (Hue, Saturation, Tone and Uniformity)
This refers to a combination of the degree of lightness, or darkness, and overall
saturation of the basic color(s) stated above, as well as how â€œpureâ€ the hue is
in terms of lacking unwanted secondary coloration. Ideally, this hue should also
be uniformly distributed throughout the stone in order to maximize its grade and
Jadeite that allows more light to pass through it is generally preferable to opaque
material, with the nest jades being translucent or even semi-transparent.
This refers to the cutting-quality of the piece, taking into account such factors
as the prole symmetry and, for cabochons, dome curvature.
The quantity and quality of light reected from the stoneâ€™s surface, especially
with regards to the presence, or lack thereof, of the â€œorange peelâ€ pitting eect
often associated with jadeite.
Effect of Heat Treatment
Residue in Fissures
Amount of Residue
The AIGS Star Rating has been developed to provide clients with a general idea about
the quality of their jadeite piece. This is primarily based on the following five
factors: color, transparency, shape, polish and, most importantly, the jadeiteâ€™s
fundamental variety. Additionally, other factors such as the itemâ€™s rarity and source
locality are also taken into consideration, as well as the market demand for such
a piece at that moment in time.
The AIGS Star Rating is the opinion of an independent group of trained experts and
the grade may vary from time to time due to the subjective nature of the evaluation
process. The AIGS Star Rating is therefore not a guarantee of the stone's quality
While the maximum rating is usually five stars, a jade piece of very exceptional
quality may, on rare occasions, be awarded a special rating of six stars or seven