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Is This Old Jade?

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chat

Dear Arthur

I bought this jade from a Chinese old lady. Some friends said that this is an old jade. Some said it is some type of stone but they can’t tell what type of the stone.

I put the light from the back as you see from the picture. Please if you will be able to let me know what exactly this is.

Thank you very much.

Chate

 askaarthurlaunewbanner

Hi Chate

In China, a number of stones are being called Jade. These may include Jadeite Jade, nephrite jade, chalcedony, serpentine, idocrase, Maw SitSit, microcline and other green variety of stones. It may perhaps be for want of a better term or perhaps calling a stone jade will add glamour and romance and helps the seller to push the sale of the merchandise.

So be aware that the term ‘Jade’ is used loosely.

Another commonly used Chinese term is Old Jade. It confers the meaning that a jade piece is of some ‘antique’ value, though it may be of an inferior quality. The term ‘Old Mine Cut’ is used widely and refers to jadeite jade pieces of very dark green.

In my personal opinion the piece of carving that you have is indeed Jadeite Jade, with russet red color tinges. However, the stone quality is quite inferior and you will treasure it more for its workmanship rather than the quality of the stone.

Arthur

Is This An Authentic Pair Of Jadeite Earrings?

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HHwa jade

Hi Arthur

I just bought this pair of earrings, it has not arrived yet, but my question is :

Is this authentic natural Jadeite Jade? The reason I asked is the green strike in the right earring, is it odd that a darker strike appears as natural?

Thank you

Janet

 askaarthurlaunewbanner

Hi Janet

From the picture, it looks like natural Jadeite Jade bezel-set on gold, though I am not sure of the karatage or whether it is gold.

The green strike that you referred to is a green streak which is commonly found on a jade piece and this type of streak is most like by many jade lovers. Jade lovers will attest that when they wear the jade with green streaks for a prolonged period of time, the green streak seems to ‘grow’ and ‘glow’. Physically the green streak does not ‘grow’, so to speak, but when a jade piece is worn for a prolong period to time, the natural sweat from the wearer’s body will make the jade more luster and one can see the green streaks clearer.

Natural Jadeite Jade is a porous stone and since natural Jadeite Jade is not impregnated with polymer, the fine capillaries within the jade stone are not sealed off by the resin. Hence, ‘oil’ can seep into the stone, making it more luster and ‘shiny’.

The color of the jade earrings is quite even and there are no visible cracks. Quite a good piece for casual wear, though this does not belong to the category of high quality jade.

Thanks Janet

Arthur

What Is The Weight Of My Jade?

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P-green ds

Hope all is well with you and your family!

I have a jadeite pendant in my collection and it’s about 21mms. Can you help me to determine how many carats it is and what do you think of the stone concerning its
authenticity?

I appreciate your help in this matter.

Thank you so much!

Sarah B.

 askaarthurlaunewbanner

Hi Sarah

Your green stone is set in a gold clasp and the weight of the stone cannot be determined.  Even if it is a loose jade, one cannot determine the weight of the stone even by knowing the full dimension of the jade. We have to use a gem weighing scale.

For Round Brilliant and Baguette Diamond, the approximate weight can be determined by using a 4 disc pocket gauge as shown in the picture below. Diamonds are almost cut to exact standard based on their gemological properties. Hence, when you place the gauge over a Round Brilliant Diamond you can get a good approximation of the weight of the stone. Or if you know the diameter of a Round Diamond you can check up the weight on the internet, for example, a 1 carat round diamond has a diameter of approximately 6.4 to 6.5mm.

diamond gauge

It is almost impossible to determine the authenticity of the jade by looking at an image. One has to sight the stone, feel it and see the texture or carry out some gemological tests on the stone.

The texture of the stone is identical to that of a jadeite jade as seen in the picture. The hue, tone and saturation of the jade are quite excellent. The color is also evenly distributed with no patches of cloudy white.  If it is a jadeite jade and is natural then this is a very good stone, though I can’t really put a value to it.

I hope the above helps.

Arthur

Picture acknowledgement : www.allaboutgemstones.com

 

 

 

Can This Bangle Be Fake?

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01emarldbangle downsized

I appreciate the education that you provide online and this helps me a lot to understand jade better. I send you an image of my bangle and this bangle was taken of a Chinese costume ornament and has been part of a collection since 1960’s until I purchased it. My questions are: Can it still be fake and what grade is it? 

Pete

askaarthurlaunewbanner

Hi Pete

It may be difficult to ‘identify’ a Jadeite Jade bangle just by looking at a picture. However, the texture in the bangle somehow does not conform to the texture of Jadeite Jade material. The grains within the bangle seem to be too even, while Jadeite Jade texture is more granular. A very highly translucent or semi-transparent Jadeite Jade bangle may also have even texture but this picture does not fit into this category.

My opinion is that this is not a Jadeite Jade bangle.

I am not sure of what do you mean by taken of a Chinese costume ornament. If I understand it correctly if this bangle was part of a costume set, for example a Costume Set from an Opera Troupe, then it is more likely that this is a ‘fake’. The term fake is commonly used in lay language but in the context of gemology a fake item is an imitation, that is, the material or physical properties of the item is not the said mineral per se, but some other material like acyclic or glass.

By ‘grade’ I take it from you to mean whether this item is of high monetary value or whether this is a highly priced item or just the common garden variety. In the jade trade we use the term ‘Type’.

Type A Jadeite Jade is natural with no polymer impregnation or dye. Type B Jadeite Jade is impregnated with polymer or resins.

You have to be careful with the representation by a seller when buying a jade piece. Often a seller will glamorize his wares by injecting some myths and stories of provenance, perhaps a jade piece is a family heirloom which has been kept for many generations or that this is a burial jade. A large number of jade retailers or sellers are traders and they like to move their merchandise fast. Occasionally one may come across some really great family heirloom pieces but chances are quite slim.

So when purchasing some ‘traditional’, ‘old-mine cut’ or ‘antique’ jade, one has to cut off the white noise and listen to your inner instinct and learn all the lessons you can. This may not be orthodox but you will acquire experience as you go along the way, if it does not make too much of a dent in your pocket.

A street peddler once approached me in Beijing with a jade bangle, which was translucent with vivid green streaks. He swore that this bangle belonged to his uncle who was the last few remnant of eunuch from the Imperial Court. He named his asking price too fast and it was astronomical. I would not even want to touch it for fear that he dropped it on purpose and forcing the sale on me. Then two men came along and try to start some bidding war. I guessed that this was just a dog and pony show.

A street peddler would not by chance be landed with a highly prized jade bangle.

I just walked away.

Arthur

Hong Kong Certificate of Jade Identification

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HK cert Floral
Certificate of Jade Identification by Hong Kong Jade & Stone Laboratory

The above Certificate of Jade Identification is done by the Hong Kong Jade & Stone Laboratory on one of the floral jade that I sent in previously.

HKJSL is a reputable and independent jade and gemstones laboratory and I often send jade for their identification. They are very professional and their certificates issued are accepted and highly regarded by all jade and gems dealers. Often, HKJSL issues certificates of Jade Identification for high end jade pieces destined for auction at Christie’s and Sotheby in Hong Kong and other international cities.

For jade enthusiast and amateurs, it may be good education to understand the terms and definitions as appeared in a Jade Certificate. Certain testing procedures are necessary but may not be sufficient for a gemologist to conclude the sample’s identity while certain tests are diagnostic to make a conclusive and affirmative call. One of the testing procedure which is mandatory to determine whether a Jadeite Jade is Type A or Type B is to scan the sample with a Fourier Transform Infra-Red Equipment (FTIR) to detect the presence of organic compounds related to the C-H bond. (C for carbon and H for hydrogen)

One has to understand that whatever tests conducted and stated in a jade, diamond or gemstones certificate as issued by a gem laboratory must be empirical. That is, if a gem lab concludes that a specific test yields a certain result, then that same test must also be observable when tested in other gem labs.

I have read some jade reports, usually some proprietor-owned lab, that states a certain result which is not based on test being carried out but based on known facts of the identity of the sample. For example, a jade certificate may state that the specific gravity of a mounted ring with jade as the center piece (which is the object to be tested) is 3.32. Yes, the SG of jadeite jade is 3.32 but how does the gemologist carried out that SG test when the stone is mounted?

Hence, some knowledge on the findings of a jade report are useful.  A brief run down on each of the item of the Jade Certificate above is described below.

Under the title ‘DESCRIPTION” the item is described as clearly as possible.

Under the title ‘TESTS AND FINDINGS’ :

a)   Refractive Index : 1.66. 

This result can be obtained by using a Refractometer.

 b)  Specific Gravity : 3.32

This result can be obtained by using the Hydrostatic method. Since this is an unmounted jade piece and it is quite small, this testing procedure is easily carried out.

c)   Fluorescence : L.W – Weak white in patches / S.W – Inert

Natural Jadeite Jade when exposed to Long Wave and Short Wave Ultraviolet light may emit weak white streaks or remains inert. When a jade piece fluorescences strongly then possibly it is an enhanced jade.

d)  Spectroscope : Fine chrome lines in the red

em_spectrum
The Electromagnetic Spectrum

The spectroscope is used to analyze light passing through a stone. White light is a combination of all the colors of the visible spectrum: red, orange, yellow, green, blue, indigo, and violet. When white light travels though a gemstone, one or more of the wavelengths that produce color are absorbed by the gem. The colors that are not absorbed are the colors seen when we look at the stone.

The wavelengths that are absorbed by the stone are seen in the spectroscope as vertical black lines in the spectrum. Each gemstone has a unique absorption spectrum (like a fingerprint of the stone) When identifying a stone we look for a spectrum that is characteristic for that stone.

 e)   Texture by Eye / By Magnification : Fine to medium grain aggregates / Fibrous and granular texture.

These observations conform to the texture of jadeite jade.

 f)    Under Chelsea Colour Filter : Green

Some dyed jadeite jade may appear reddish under a Chelsea Filter, but not all dyed jade. This is an additional test but is not diagnostic nor conclusive and it shows that procedures undertaken by the gemologist is thorough, exhaustive and well documented.

 g)  Polymer Detection : No polymer is detected.

Below this description are two charts showing the spectrum as scanned by an FTIR equipment. Both charts are the same, the first chart has the Y-axis as the Percent Transmittance while the second chart has the Y-axis as absorbance. The bell curve on the right is the molecular fingerprint of a jadeite jade. When polymers are detected there are certain peaks and these peaks identified the jadeite jade to be polymer impregnated. There are none shown on the charts.

 With all these tests being carried out , the gemologist concluded that the sample tested is Natural Jadeite Jade and the final diagnostic test on the FTIR determined that the jade piece is free from polymer.

Hence, the Conclusion is “Natural Jadeite” with a remark stating that “Sometimes known in the trade as “A Jade”.

Some of the gemological tests on the above are described in my earlier posts. Please use the Search function if you want to be clear on these gemological terms and tests.

In latter posts I shall show you some gem lab reports that are flawed and thus one has to be on the alert for these so-called gemologist.

 

Acknowledgement : http://prettyrock.com

 

10. What To Do With Broken Jade Bangle

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Part of a broken bangle made into a suite of jewelry

Further to this post, Broken Jade Bangle, where a reader enquired on the use of a link-bracelet to join up the parts of a bangle, I have received numerous emails pertaining to the said post.

 

A ring set on 20K gold, part of the pieces of a broken jade bangle

Jade bangles that are broken into 2 or more pieces are quite common.  One does not have to keep the broken pieces in your drawer.  You can set it back with a link-bracelet or do some other designs on it.

Here, I am showing the pictures on the design on a broken jade bangle.  Perhaps if you have other ideas and want to share it, please email to me and I display it on my website.

 

A broken bangle linked by 18K white gold

Thank you

A Arthur

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