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Precious Coral

Precious corals differ greatly from the more commonly known reef corals. Before precious corals can be used for jewelry, they must grow for hundreds of years in the ocean depths beyond 100 meters.

Precious coral (Octocorallia)

Octocorallia has eight polyp (coralworm) tentacles.
It lives in the deep sea where the sun's rays do not reach at a depth of 100 to 1,200 m, and it takes decades to grow 1 cm. This Octocorallia is a jewel coral that is generally called coral.
Since it lives in a place with very high water pressure, its hardness is about 3.5 Mohs hardness, which is almost the same as that of human teeth.

Reef-building coral (Hexacorallia)

Hexacorallia has six polyp (coral bug) tentacles.
Generally referred to as reef-building coral (so-called coral reefs such as table coral, mortar coral, stone coral, etc.) It grows on a shallow coastline that can be reached.
Hexacorallia grows 7 to 8 cm a year at the earliest, has small holes and is very soft, so it is not processed as jewelry.

The Wonder of Precious Coral

Precious coral’s history spans back over 20,000 years. Originating from the Mediterranean coast, it has been treasured since ancient Greece and Rome as a charm for luck and happiness. Later, as it passed through the Silk Road it became an important protective symbol in the three major religions of the world. Even in Japan it rose to popularity in the same time period as Buddhist cloisonné.

Precious Coral Variety

Japanese Red Coral (Oxblood‘AKA’Coral)


‘Aka’ corals are collected in the oceans near Japan, with those of the highest quality and deepest color being found off the coasts of Kochi Prefecture.
Its rarity and deep red coloring make it prized worldwide as a stone for use in high jewelry.

Mediterranean Coral


This coral is collected from the Mediterranean Sea and possesses reddish-orange hues. Because it lacks the luster and beauty of ‘Aka’ coral, it is not used for high jewelry.

Momo Coral


There is a wide range of shades from red to nearly white.
Momo coral can be found in wide distribution around the Pacific Ocean, from the seas near Japan to West Asia, and can grow to be the largest of all precious corals.
It is often used as material for large carved sculptures or as adornments in many traditional costumes across Asia.



This coral is so rarely collected that it is sometimes referred to as a ‘phantom coral’.
It has a beautiful light pink color and is coveted in Europe under the name ‘Angel Skin’. The highest grade, called ‘hon-bokeh’, is extremely valuable with the suspected likelihood of finding even a single branch being merely once a decade.

White Coral


Distributed from the seas near Japan to the East China Sea, white corals contained a wide range of colors from pure white to brown and pink-white. The rarest variety of white coral is referred to as ‘snow white’, and has no mixing or traces of color whatsoever.

Maintaining Precious Coral Jewelry

KAWAMURA offers complimentary standard maintenance service for its high-end coral jewelry brand products.
The main component of gem coral is calcium carbonate, and acidic substances such as sweat and cosmetics may dull the shine and discolor the stone. After wearing your jewelry, please wipe it with a clean, soft cloth. Hot springs, soaps, and shampoos can contain corrosive components such as sulfur and others acids, so please remove your jewelry before when bathing.

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