1, Beijing Zhong Da Jewelry Appraisal Center. Address: North of Beijing Cheap House Hotel Chain (Xisi Subway Station), Xisi South Street, Xicheng District, Beijing, Beijing Zhongwei Jewelry and Jade Quality Testing Center. Address: Room 6020, Feng Wan Jewelry, No.59 North Street, Xinjiekou, Xicheng District, Beijing.
2. Gem Appraisal Center of Peking University, Address: Room 3303, New Teaching Building of Peking University, Zhongguancun, Haidian District, Tel: 0 10-62755676. China Geo University Dida Gemstone Inspection Center, Address: No.29 Xueyuan Road, Haidian District, Tel: 82323039.
3. National Jewelry and Jade Quality Supervision and Inspection Center Address: 9th Floor, Tianya Antique City, southwest corner of Huawei Bridge, East Third Ring Road, Chaoyang District, Beijing. Price: about 150 yuan/piece.
How to identify jadeite? What are the methods of jadeite identification?
1, identified by hardness. Real jadeite has a high hardness. We can scratch or scrape the surface of jade with sharp nails or knives. If it is real jade, the surface of jade will feel very slippery and will not leave any scratches.
2. The easiest way to identify jadeite is as follows: Weighing: jadeite belongs to jadeite, and its hardness is about 5 to 7. When you put jade in your hand, you will feel like you have left your hand. If it is too light, other aspects of jadeite need further identification. Listen to the sound: jade is dense, so it is brittle.
3. Jade appraisal has a coup. It is enough to master these jadeite identification methods: violet light irradiation is to use a violet flashlight to see if jadeite has a fluorescent reaction.
4. The simple methods to identify the authenticity of jadeite are: looking at luster, fluorescence reaction and institutional identification. Look at the luster.
How and where to identify jadeite?
Jade can go to an authoritative jewelry and jade appraisal institution with national qualification certification for instrument appraisal and issue an appraisal certificate. The simplest way to identify jadeite is: luster: after being soaked in strong acid and alkali, jadeite has loose structure, and there are pits on the surface before it is full, which makes it spread and its luster weaken.
General jewelry appraisal bureau, jade wholesale market, large jewelry stores can identify the authenticity of jade.
Jade can go to an authoritative jewelry and jade appraisal institution with national qualification certification for instrument appraisal and issue an appraisal certificate. In this way, the result is exact, the authenticity is clear at a glance, and it can be foolproof.
The easiest way to identify the authenticity of jadeite.
Simple identification method of jadeite: observe whether jadeite has glass luster, and jadeite is really glass luster. Observe whether the jade surface is smooth, and the jade surface is really smooth. Tap the jade to see if the sound it makes is crisp and pleasant. Really, the jade sound is crisp and sweet.
The first grade jadeite is called jadeite. Color, transparency, uniformity, shape and tapping are the methods for ordinary people to appreciate or evaluate jadeite. Jadeite can be divided into: glass type, dark pit, old pit, gold wire, oil clear, bean green, flower green and melon green.
Listen to the sound. When identifying jadeite, you can tap its surface gently first and listen to the sound made by jadeite. If it is natural jade, you will usually hear a crisp sound when knocking, because the internal structure of natural jade is dense and there are no bubbles; On the contrary, tapping on artificial jade makes the sound less crisp and dull.
The simple method of identifying jadeite is as follows: identify by weight. Because the density of jade itself will be relatively high, we can move jade up and down in our hands a few times, and we will feel a heavy downward pressure, which may be the real jade.
Look at the luster. Swing the jade left and right in the sun, carefully observe the luster of the jade surface, and identify the authenticity of the jade. Natural jadeite has a good glass luster, but the luster is not very strong. Jade has a strong resin luster after artificial dyeing and glue injection. Fluorescence reaction.
The identification method of jadeite is as follows: look at the color root. Natural jadeite, especially green jadeite, has color roots. A color root is a place where green is thick, and then green will spread around the color root. Under the transmission of strong light, green will fade or disappear in some places, but the color root is still green.