About us

Store Name

Dealer Name
D&M Pearl Company, Ltd.

Names sales manager
Yukie Demiya

Gyoen Heim 3F, 4-24 Yotsuya
Shinjuku-ku, Tokyo 160-0004 Japan

Phone number
+81 (0) 3 3350 0784

FAX number
+81 (0) 3 3350 0779

E-mail address

Akoya Pearls
The marine culture process was first developed around 100 years ago in Japan. The original Japanese cultured pearls, known as Akoya Pearls, are produced by a species of small oyster.
Pinctada fucata is the pearl oyster which is used in Japan. Cultivation of Akoya Pearls takes 10 to 18 months from the time they are nucleated. The akoya oyster creates pearls from 3 to 10mm diameter. Akoya Pearl cultivation is most difficult and costly because of the low survival rates of their host oyster.
South Sea Pearls
The pearl oysters which produce South sea pearls are bigger than those producing Akoya pearls. Normally they reach hand size and some even the size of a dinner plate. These oysters usually produce pearls sized 9 to 15 mm and some pearls can even reach diameters of over 20 mm.
The colour of the pearls varies due to the oyster species used and the environment in which they are growing.
Tahiti Pearls
The discovery of the Pinctada Margaritifera oyster, an oyster species with dark shells, by pearl scientists encouraged pearl production to spread to Tahiti and French Polynesia in the 1960s.
The colours of Tahiti Pearls range from dark shades like black, grey and brown to silver blue. Some even have an overtone in red, green or blue.
Keshi Pearls
The name Keshi is used for all sizes of irregularly shaped pearls, which normally consist of nacre.
Normally the pearl producers try to produce a round pearl. A round shell nucleus with a piece of mantle tissue is introduced into the oyster. If the oyster expels or displaces the shell nucleus during the growing process, the oyster will build up layers of nacre wherever a fragment of mantel tissue remains. This process will usually create a pearl with an irregular shape (as the pearl has no shell core). Such pearls are called Keshi pearls.
Freshwater Pearls
In the 1920s in Japan people started experiments to grow pearls in freshwater ponds, lakes and rivers. Before that pearls were only harvested in oceans. The first freshwater pearls came from Lake Biwa in Japan.
Right now freshwater pearls are mainly produced in China. It is much cheaper to produce the freshwater pearls in China, because the labour there is much cheaper.
The pearl mussel Hyriopsis Cumingi is used to produce the freshwater pearls. The pearl colour depends on the colour of the shell and can be white, purple, peach or pink. The pearls can reach sizes bigger than 15 mm in diameter, whereas the normal sizes are from 2 to 12 mm in diameter.