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Is This Jadeite Jade?


Dimple Surface of a Green Stone

Hi Arthur,

This is a picture of a broken jade stone tool that I found recently.  I read your article about the dimple effect on jadeite and noticed similar dimples on this stone.  What is your opinion on the pictures?



Hello Mike

Thank you for your question on the above.

Your piece looks like Jadeite Jade to me.  I have seen a lot of semi-cut, weather-worn and rough Jadeite Jade where the crust has been stripped that appears the same as your pictures.

Regarding the dimple surface of jadeite jade (read here) this is not a conclusive test.  However, I can say that you can rule out Serpentine, calcite, malachite and microcline.  Perhaps it may be Nephrite through the surface of Nephrite Jade has a more fibrous structure.

Since your piece is not a big one, you can easily take the Specific Gravity (read here).  You can take it to any high school students and they will be able to take the SG quite easily.  If you get an SG of your sample piece to be 3.2 and above you can safely say that this is a Jadeite Jade.  Nephrite has a lower SG of 2.95.

You can also take another indicative test by using the stone’s hardness.  Use a quartz and scratch it.  If it leaves a dent then it is not jadeite jade.  Mohs hardness (read here) of Jadeite Jade is about the same as quartz and we often use a quartz pointed crystal to do the scratch test.

If you have any additional information on this piece, I would be happy to render an opinion.

Thank you

A Arthur Lau

You may have missed other posts of interest. To read them, please click on the picture

Is This A Genuine/Faked Bangle?


Dear Sir,

I recently bought a cloudy green jade bangle. This is my first time buying jade.

As I chose a different kind of green shade than the ones I found commonly in the shop, I am a bit confused regarding the genuineness.

The bangle was not overly expensive, but was not cheap either.

The bangle is cool to touch, heavy and as the shop assistant showed me, is translucent under a torch light.

I am sending the photos for your reference. I would be obliged if you can tell me whether it is genuine/fake.

Your website does have very valuable information. Thanks for finding time and patience to share the nicely written up contents.

It is quite helpful for naive people like me.

Many Thanks,


Hello Aswathy

You describe your jewelry as a jade bangle.  In the United States under the Federal Trade Commission (FTC) rules on gemstones and jewelry, if a seller describes his/her product as ‘Jade’ then it must be either Jadeite Jade or Nephrite Jade and no other material.  In recent years FTC also stipulates that a seller must disclose whether the jade has undergone any enhancements and if it has, the seller is obliged to disclose that the jade is a B-jade.

Jade Bangle

Based on the photos your jade bangle is most likely a Jadeite Jade bangle.  A Jadeite Jade bangle almost has ‘clouds’ within the stone.

Most jadeite jade bangles are genuine so to speak, that is, the jade cutter used jadeite jade mineral to cut a bangle.  However, in today’s jade market a buyer should be more wary of natural Jadeite Jade vs enhanced Jadeite Jade (that is jadeite jade which has been impregnated with polymers).  And the most commonly used terms (though not really accurate) of real jade refers to natural jade while fake refers to enhanced jade.

It would be impossible to determine whether a jadeite jade has been impregnated with polymer without testing the sample with an FTIR (Fourier Transform Infra-Red) equipment.

Please refer to my previous post, Jade Bangle, Hear Me Out, so that you can carry out this simple test.  It may not be 100% accurate as you may not be able to differentiate the sharpness of the pitch but you may be able to recognize the dull ‘thud’ sound as emitted by a polymer impregnated jade.

What then is the description of the product in your receipt?

If you have any further questions I will be happy to answer them.

Good luck Aswathy

A Arthur Lau

You may have missed other posts of interest. To read them, please click on the picture

White Nephrite Jade Boulders


Rough Whitish Nephrite Jade Boulders

Mike, an old friend of mine who is a jade miner, dug up a number of rough whitish nephrite jade boulders.

If anybody is interested in buying I can give you his contact so that you can deal directly with him.

Nephrite Jade Boulder Rough

The pictures show the rough whitish Nephrite Jade.

Ask Me A Question?


Want to know whether your family heirloom jewelry is the real Mccoy or a dud?  Whether the jade bangle you purchased is genuine or a polymer-impregnated jade?  How about the diamond ring that you have been wearing for years?  Do you have any questions on the rough gems you purchased from an unknown dealer?   Or how do you take care of your jewelry?

As a practicing gemologist for many years, I have often being sought for advice on questions relating to diamonds, jade, gemstones and jewelry.  From some comments on my website, there have been several enquiries from my readers on whether the jewelry or gemstones that they have in possession are genuine or fakes, on how to differentiate between jadeite and nephrite, as well as other questions relating to jewelry and gems.

So I thought it would be a good idea if I start a column to deal with questions from my readers.

If you want to make enquiries on your jewelry or gems just follow these simple steps:

  • You must be a subscriber to my website;

(just enter your email at the top right hand corner);

  • Your enquiry must come through the Contact form at the top of page;
  • You have to send me some pictures of your specimen to

The above service does not constitute a service and payment contract.  No fee is charged.  However, terms and conditions apply and they are stated at the bottom of the Home Page. By sending the author an enquiry through the Contact Form, it would be taken that the enquirer understands and abides by the Terms and Conditions.

The opinion given by the author will appear as a post.

Ask A.Arthur Lau: Terms & Conditions

By sending an enquiry to Arthur (herein known as the Author) to this website, to request an opinion on a specimen item, the reader (herein known as the Enquirer) understands and abides by the following Terms & Conditions.

The Enquirer must be a subscriber;

The Enquirer must send through his/her request through the Contact Form found at the top of the page;

Pictures of the specimen must be sent to;

This is a non-fee service rendered to the Enquirer by the Author;

The Author will not assume any liabilities nor entertain any consequential claims by the Enquirer or any third parties should the opinion of the Author differs from what the Enquirer obtains from other sources;

The opinion by the Author is only based on the written information and pictures sent by the Enquirer.  There are by no means conclusive.  Therefore, the Enquirer must seek the advice of a gemologist or any specialist should he/she wish to pursue the matter further;

The written enquiry by the Enquirer will be printed as a post in total.  The opinion of the Author will also be printed on the same post. The post will appear in the Category of ‘Ask A.Arthur Lau’;

Any private correspondences to the enquiry by the author will be taken to be on a private and confidential basis;

If the Enquirer mentions that the specimen in question is purchased, acquired or obtained from a vendor with the vendor’s name stated in the enquiry, the vendor’s name will be replaced as XYZ company.  This is to avoid any conflict of interest and any subsequent law suits should the opinion of the Author differs from what the vendor represented to the Enquirer on the specimen;

Once the Author posted his opinion the Enquirer can choose to unsubscribe to this website if he/she so wishes.  There is no compulsion to remain as a subscriber;

The Enquirer cannot use the opinion of the Author on the subject specimen as material evidence for any courts of law to pursue any legal suits against the vendor of the Enquirer;

Any photos relating to the subject specimen send to the Author by the Enquirer are deemed to be the properties of the Enquirer and that there is no infringement of copyright when the Author publishes such photos;

The Author may choose not to give any opinion on the subject specimen should the Author finds that there is insufficient information to render an opinion;

Any opinions given by the Author and posted on the Author’s website are deemed to be given solely to the Enquirer.  The Author will not be responsible and held liable if the post appears on other websites;

The above terms and conditions may be changed, altered or amended at anytime without any notifications to any parties.

Gold Ring – Is It Fake Gold?

Wedding Gold Ring

Hello Arthur

My husband bought me a Gold Ring as our wedding ring many years back in Hong Kong.  There is an indent marking on the inside of the ring and by using a magnifying glass I can read it as 20K gold.  I understand that 20K gold means a pure gold content of at least 83% pure gold.

I brought the gold ring to a local jeweler and he used a ‘gold meter’ to test the content.  The meter reading indicated that the gold was as stated.

However, I am still not confident as the weight of the ring seems to be very light to me as compared to other gold rings my family had.  I read one of your posting that by hefting (read here) the object, we might get some idea of the weightiness of the jewelry, but I am no expert.

How do I know whether we have been cheated whereby the gold content is not up to the marking as shown?  I enclosed a picture for your viewing.

Your input is much appreciated.  Thank you

Josephine Cartel

Hi Josephine

A 20K hallmark on the inside of a gold ring means that the gold content must be equal or more than 83.33% of pure gold content while the remaining percentage can be an alloy of silver, copper or nickel.  It is also a standard practice of the jewelry gold industry that a gold ring which is hallmarked as 20K gold should be at least 83.5% of pure gold.  The additional small percentage is to make up for some welding joints which may have a lesser gold content to make the joints harder.

Your gold ring does not have any shoulder joints, so therefore, the pure gold content must be at least 83.3%, if what is represented by the jeweler is true.

You can take the gold ring to a Gold Assay Office to have the content assayed, however, this cost money.

Regarding the gold meter testing it may not be 100% accurate.  The reason is simple.  The Gold Meter works on the principal that gold is an excellent conductor of electricity. By testing the conductivity the meter will show a reading indicating the gold content.  However, if the gold coating is thick enough (while the inner content maybe a lead compound) then the meter reading may give you a faulty or fallacious reading.

Since your gold does not have any stones mounted, taking the Specific Gravity (SG) of the ring will be an accurate test to determine the gold content.  The SG of gold is 19.3, hence, the SG of your ring should be somewhere around 16.  You should make an allowance of 5% margin of error.

Most goldsmiths understand the principal of using SG to determine the gold content.  So you can perhaps take it back to a goldsmith jeweler and request him to check the gold content.

Read here to understand about specific gravity.

I will be putting up a post regarding the use of specific gravity later. You can do it yourself if you have a weighing equipment up to 0.00gm accuracy.

So do look out for that post.

104Kg Jade Boulder


A Weather Worn Jade Boulder of 104 Kg

Mike, a reader of my website, sent me some very interesting pictures of a 104kg jade boulder that he dug out from his mines.

A Weather Worn Jade Boulder
Not Many Visible Cracks In Jade Boulder Of This Size

From the pictures the boulder does not have many crack lines.  It is weather worn with its smooth crust.

From previous pictures (read here) Mike sent me this jade boulder maybe a Nephrite.  Even for a Nephrite Jade of this size and weather-worn, it is an excellent rough.

If there are any interested buyers I can put you in contact with Mike.

Tag : Nephrite Jade, Weather-Worn Jade Boulder


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