Gently place the jade item completely into the water bucket and write down its weight in water. Since the test is based on the difference in weight, as long as the string, band or pony tail holder remains on the jade both in the air and in the water, the difference will be the same. Calculate the volume of jade item: weight in air then divide by or if you have a calculator handy minus weight in water divided by or if you have a calculator handy. This gives the mass in grams in air and the apparent mass in water.
Subtract the in water value from the air value, this gives you the volume in cc. Calculate the density of the jade item: mass in air divided by volume. Jadeite has a density of 3. Check The Density Of Jade A specific density gravity test can be performed as described below, or you can judge the density less accurately by tossing the stone in the air and catching it in your palm.
Cold Test Hold the piece of jade in your hand. Perform A Scratch Test Jadeite is very hard; it will scratch glass or even metal. Look For Other Deceptive Practices Even if you have real jade in your hands, it can still be treated by dyeing, bleaching, use of stabilizing polymers, and creating jade doublets and triplets.
Was this article helpful? Related Articles. What are Synthetic Gemstones, Imitation and Simulants? What Is Nephrite Jade? Meaning, History, Value, And Price! Latest Articles. Gem Rock Auctions 12th Nov Black onyx is a type of layered chalcedony in midnight Approved Gemstone Testing Laboratories 11th Nov Gem rock auctions has one of the largest range of Green Gemstones: Which Gems are Green? Due to poor images I am unable to determine if it's a hand carved, drilled or by laser.
I suspect it's the later. I have seen some remarkable so-called carving of late. All done by laser and very convincing. You will notice that the base is heavily scratched. This is because the stone is very soft.
You could easily mark it with your fingernail. If this was genuine nephrite jade the base would not be easily scratched. That's not to infer that it jade can't be.
If this was say a genuine jade carving from 19th century one would be able to see very tiny scratches with the aid of your trusty loupe. I can't tell you how to buy or tell the difference between jade and its numerous simulants in a single post. It's impossible. It takes many years of studying and more importantly hands-on. You can't learn this purely from images. You must handle both genuine and simulants. Also it's not just limited to nephrite jade. There is jadeite jade which is even more difficult than jade due to its high price.
Chinese jade from the Neolithic to the Qing by Jessica Rawson. This edition is excellent and is often cited by leading dealers and auction houses. What you really need John is a mentor in jade if you are genuinely interested. I mentioned dealing because I know collectors who have been buying fakes for years! It's only when they try to sell part of their collection was there a rude awakening. Mark is definitely correct about collecting it - highly specialized, and so many collectors have large collections of utter junk.
In fact, in 10 years,I've only ever bought pieces.. I stay away unless it's absolutely obvious I'm buying a quality piece. I'm not familiar with the use of lasers to carve soapstone figures Mark, can you share what you know? Is it like a 3d printer? Yes it's by 3d printer. Unfortunately I can't show you any at the moment as I deleted them long ago. They are very convincing at first sight. Actually when I first saw one I thought it was genuine until a friend told me otherwise.
Yes, I would love to have a mentor s. And I would love to handle a large number of all types of real and reproductions to compare. I am trying to learn as much as possible. Thanks for all the advice. Every little bit helps. I spend time looking at high end auction pieces to discern what I can about the genuine examples. In doing so I am trying to embed a certain sense of quality to my standards that I can use as a general filter.
Most things I see when searching around for treasures are now obvious lesser quality, so I guess I'm learning a little bit at least. But I have no clue when it comes to high end reproductions. I definitely could fall prey to that trap, so I avoid them for now. Unless of course I happen upon something that I sense has potential that may have fallen through the cracks, and I can grab it for little money so it's not a huge gamble, but potentially a great payoff.
I wasn't sure if this little Buddha could be one of those. I would have to buy it without handling it though and then examine it more closely in person once it arrived, so that isn't ideal. One specific thing perhaps you can help me learn from with this Buddha is the area on his belly to the inside of the fold in his robe. That area and also other areas next to the folds is rough, as though it wasn't polished. Is that typical of genuine examples or is that a sign of poor workmanship and possible machine done items?
Whenever you encounter a carved piece whether it's soapstone, jade or other and you see this. Do not buy it! It means that the piece is highly probable to be resin. With the item in question it is in my opinion not resin but laser carved. That's why it's imperative that you always carry and acquaint yourself with a loupe like I believe you do.
You would be surprised how many people I have encountered who own a loupe but don't know how to use it properly. I keep seeing examples listed as "hand carved resin". Christmasjoy , cxgirl and komokwa like this. Waxy isn't how resin generally feels, unless maybe it needs to be cleaned. Bronwen , Jan 18, Christmasjoy and cxgirl like this.
Greg Wolf produces a line of totems, and possibly bears, using a resin that has a mottled greenish color; this might be one of his. Here's a detail from one of his items:. Christmasjoy , judy , Any Jewelry and 3 others like this. Cute little guy. Alaska souvenir? Christmasjoy , kyratango , judy and 2 others like this. Christmasjoy , kyratango and judy like this. He is very cute, I like him. Agree with Steve, resin. It has the same swirls, and there is a little hole in the base, a bubble maybe?
0コメント