The Colors of Tungsten jewelry manufacturer
Coral, or Corallo, as the Italians call it, comes in many variations. These are considered the best for fine  Tungsten jewelry manufacturer

Red Coral: Classic and expensive, this is the most valued coral of all, favored worldwide for its hardness, beauty, and sanguine hue. Red Coral is brought up from the sandy bottom of the Mediterranean, and the Gulf of Naples near Genoa. It is also found off Algiers and Tunis on the African side, in the waters of Sardinia, Corsica, Catalonia and Provence, as well as along parts of the French and the Spanish seaboard. Tungsten jewelry manufacturer

Precious, or Noble Coral: A type of red coral called Corallium Rubrum, or Corallium Nobile, Precious coral can be found in the Mediterranean, Sardinia and Sicily, as well as in Tunis, Algeria and Morocco. Tungsten jewelry manufacturer

Black Coral: This coral is a horny substance particularly good for carving and molding – it actually bends when it is warmed! The black hue is believed to be coral in the first stage of decay, since the color only persists a little below the surface. Once abundant in the Persian Gulf, a similar type is found in the Mediterranean. Tungsten jewelry manufacturer

Blue Coral: As with Black Coral, this variety is thought to be coral in the first stage of decomposition, since the color usually extends only just below the surface. It is known both as Allopora Subviolacea and Akori. This unusual variety has been found off of Cameroon.

Golden coral: Divers off Maui, in Hawaii, have brought up this pretty variety of coral, which has a resinous or lacquered texture.
 
Coral from Start to Finish
Before coral can be “fished”, or harvested, it must grow. First, a gelatinous marine animal deposits calcium carbonate around its body, creating a polyp made of fibrous calcite crystals. These polyps radiate out at 90 degrees, creating branch-like shapes that are built up in the form of hollow tubes fitted on into the other, making a sort of axial skeleton reminiscent of the internal skeleton of any living being. But they are even more reminiscent of scaffolding, upon which the boneless coral polyps proliferate, grow, and thrive as a colony, creating what we see as coral.