Know the snow coral

Snow coral, the scientific name of South Branch Coral, is a unique gem coral in Taiwan's waters. Gemstones, also known as deep-sea corals or valuable corals, do not build coral reefs and are coral materials made into coral jewelry.

What is snow coral?

The so-called "coral" is just a general term, in fact there are thousands of species. In addition to shallow sea corals and deep sea gem corals, we will also hear related names such as soft corals, stony corals, gorgonians, black corals, golden corals, blue corals, thousand-hole corals, etc. Reef corals. The general public often refers to the coral reef as "coral" in the pronunciation of Mandarin, and the "coral" called by the gemstone industry is not a thing, so the two are easily confused. In fact, in the Minnan dialect, the older generation of Taiwanese people have made deep sea gem corals a "coral", and the shallow sea coral reefs are called "meteorites" because of the difference in physical and economic value, so they will not speak two. Confused.

In general, gem corals grow on the continental shelf of 200-2000 meters deep, and their growth is extremely slow, about 20-30 years old, 300 years old and one kilogram. Gem corals are dark red, pink, pink, pink, and white, so they are called multicolored corals. Among them, the white coral is beautiful because its shape is like a jade tree, the lubrication is crystal clear, the color is bright and white, and the whole tree is like a winter snow hanging branch, which is also dazzling, so it is also called snow coral. Although the main components are similar to shallow sea corals, they are all calcium carbonate, but the hardness is very high, similar to ivory, the color is also white, white, ivory, so it is also called ivory coral.

Snow coral color genesis and structure

The color of gem corals is formed by the deep sea waters in which they are distributed. The seabed develops a large number of volcanic activities. These activities provide many volcanic ash materials with a certain number of macroelements (such as iron, fierce, magnesium, potassium, and sodium). Etc.) as well as trace elements (such as zinc, bismuth, chromium, etc.).

In the process of calcification, the coral absorbs various elements in the seawater. If the adsorbed element is mainly iron, the color of the gem coral is red; if the adsorbed element is mainly magnesium, and a small amount of iron, Then the color of the gem coral will be pink or pink; if the adsorbed element is mainly magnesium, there is almost no other impurity, then the color of the gem coral may be white.

Snow coral is mainly composed of magnesium, and there are almost no other impurities. Its structure can be seen from the composition of matter, physical properties and chemical properties.

Material composition: mainly calcium carbonate CaCo3, accounting for 94%-97%, in the form of microcrystalline calcite aggregate, the other 34% are magnesium carbonate, calcium sulfate, iron oxide, organic matter, etc.;

Physical properties: waxy, grease luster, transparency (sub-translucent) to opaque, luminescence is non-fluorescent, average refractive index is 1.486-1.658, hardness is 3-4 grades, specific gravity (relative density) 2-3g /cm2;

Chemical properties: In the case of dilute hydrochloric acid or carbonate type, chemical reactions such as air bubbles may occur.

Snow coral gemstone value assessment

At present, gem coral is the most expensive of the dark red AKA red coral, but in Taiwan's history, in 1976, red coral and peach coral were of equal value; before 1961, peach coral and white coral were more expensive than red coral. The color and blockiness, color and texture of the gem coral are the main basis for evaluating the price. In addition to growing slowly like red corals, snow corals are also very rare and expensive. Because the texture of the snow coral is delicate and white, it is very rare nowadays. If it is a fine coral, its price is quite considerable. Coral color, pure and even, full and not dark, bright and bright, contrasting and harmonious is the top grade. There are few corals, no cracks, and no impurities.

Snow coral is mainly made up of 4-15mm white beads in the gem making process. White bead is mass-produced and sold to Japan as a rosary or a small piece of jewelry. The body diameter of 2cm or more is carved into flowers, flowers, birds and characters. modeling. In Europe and the United States, pink coral and snow coral are regarded as the trend of fashion, the mainstream elements of jewelry design and the first choice for collection.

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