Millennium Coral Wan Nianhong, the finished red coral necklace, is very eye-catching and an ornament to be imitated by the upper class. The red coral necklace is also valuable today because it is a high-quality coral.

The output is decreasing year by year, and the price of high-quality red coral necklace in the international market is increasing year by year.

1998, the premium and first-class red coral necklaces of Hong Kong International Jewelry Fair, the price can reach tens of thousands of Hong Kong dollars each. The average second and third grade red coral necklace costs a catty.

Identification of red coral

(1) Calcium carbonate coral: Dendritic structure with small holes on the surface and radial cross section. Dendritic structure can be seen when cut into small round beads and semi-round beads. Reaction with dilute hydrochloric acid

Should be able to produce a lot of bubbles.

(2) Organic (horny) coral: the cross section is concentric, the surface is uneven, and there are many small bubbles, among which golden coral has a unique papular appearance. This kind of coral is sour and won't foam.

(3) gilson synthetic coral: The dendritic structure of coral can't be seen under the magnifying glass of 10 times, and the relative density is 2.45.

Identification of dyed coral;

Often dyed red, pink, etc. Magnified observation shows that calcite particles and cracks are dark in color, or try dipping a cotton swab in acetone.

Filling treatment: Porous coral is filled with epoxy resin or colloidal substance, which can be checked by hot needle, density and infrared spectrum.

Squeeze corals: corals are crushed and bonded together. The typical distinguishing feature of this extruded coral is that it does not have the typical structure of coral. In addition, the presence of the adhesive can be recognized by infrared rays or the like.

Others: There are methods such as bleaching treatment.

Red coral pendant with diamonds