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Classification of Jade

Jadeite-jade is a monoclinic mineral belonging to the pyroxene group with a chemical composition of NaAl(SiO3)2. Jadeitite is composed of interlocking grain structure. Jadeite together with one or two closely related pyroxenes: acmite [NaFe(SiO3)2], or diopside [CaMg(SiO3)2] forms a continuous isomorphic substitution series. Variations in the properties of jadeite depends on the proportions of each pyroxene present. For example, if diopside forms as part of the jadeite composition, then the material can be called diopside-jadeite. If an intermediate composition of acmite and jadeite is present, it is known as chloromelanite. This material appears blackish green to nearly black, due to the presence of a certain amount of iron.

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Chemical and Physical Properties of Jade

Chemical and Physical Properties of Jadeite and Nephrite

Jadeite is a silicate belonging to this group's inosilicate subdivision. Jadeite belongs to the pyroxene group of minerals within this subdivision, along with about two dozen other minerals (see Morimoto, Fabries, et al 1988; Hauff 1993: 85). The latter include aegirine, diopside, enstatite, and spodumene (hiddenite and kunzite). Curtiss (1993: 75) remarks that "the pyroxenes are one of the most complicated mineral groups known." Jadeite's chemical composition includes sodium, aluminum, and silicon. Jadeite's ideal composition is NaAl(Si203)2.

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Jadeite Types and Treatments

Jadeite Types and Treatments
 
 
The treatment of jadeite in an effort to enhance its value has a long history, but it has become an especially widespread phenomenon in recent years. With the appearance of jadeite that had been bleached and then impregnated with polymer on the market in the 1980s it became common practice to classify jadeite according to the presence and type of treatment. At first there were three categories—"A", "B" and "C" (see Fritsch, et al 1992, Mok 1999: 10).

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Assembled Jadeite

Various types of assembled or composite pieces of jadeite appear to have been around for some time. 

Writing in the 1950s, Ehrmann (1958: 135, 158) describes a type of assembled jadeite triplet made in Hong Kong. The triplet is comprised of a hollow cabochon of very fine translucent white jadeite that is about 0.5 millimeter thick, a smaller cabochon that is cut to fit into the hollow one, and a piece of flat, oval jadeite that covers the bottom. The center of the cabochon is "colored with a jelly-like dye of the same color as the finest Imperial jade." The oval bottom is glued to the top and repolished. Ehrmann (1958: 158) states that "When unset, such triplets can be recognized easily by the seam on the bottom of the cabochon." But warns that once set "in the Chinese fashion (i.e., with a plate covering at the bottom of the stone, making the ridge invisible)... the result is perfect, giving the appearance of the finest quality, most expensive jadeite." A more conventional triplet was reported by the GIA in the mid-1960s "containing a green cement layer" (Walker 1991: 35).

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After Sales Maintenance of Jade

Good question on after sales maintenance.

Due to different polishing techniques, the lustre of jade will last differently.  Poorly made ones will lose their lustre after 1-2 years.

In terms of maintenance,wash the jade item then wipe the jade with sheepskin. If the ambient humidity is quite low, then wipe the jade with a soft wet cloth to increase the surface moisture.

Don’t put the jade craft under the direct sunlight or spotlight too long. 

To take good care of your jade jewellery or art craft collection, there are following principle to follow:

1. Avoid hitting with other hard substance. Even if the hardness of jade is higher than normal stone, while sudden hit might cause very fine crack internally. This kind of hidden crack will climb up to the surface when time grows.
2. Avoid the touching with dirt or grease. If there is any dust on the surface, soft brush is preferred. Where if there  is any dirt or grease, you can use very light soap water. Do not use chemical detergent.
3. Preserve your jade separately in jewellery box to avoid scratching by other items.
4. Avoiding contact with perfume, chemical liquid, soap or sweat, because they will affect the colour of the jade. Jadeite and goat fat white jade are very sensitive to sweat and grease, it is better to clean it with soft cloth every time after the wearing.
5. Avoiding strong direct sunlight. The molecules of the jade will expand after heating, the structure will be harmed.
6. Over dry environment is also harmful, the jade will lose its water inside and its unique luster.

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