Kosa - Cross Silver Blue Gray Semi Baroque Akoya Pearl Ring

To know “oneself” by feeling “different”

Kosa series Jewelry created by jewelry artist Kazuko Nishibayashi and "MENTOSEN"

Kazuko Nishigayashi is a jewelry artist based in Germany for more than 20 years.


It may be a hassle, but let's get involved with people a little more.

Each of the semi baroque blue-gray pearl is different and unique.

Because the world is full of colorful people.

By crossing, we can feel to know “oneself” by feeling “different”.


This collection was created by providing pearls from Doi Pearl, a pearl farm in Uwajima, Ehime prefecture in Japan.

Delicate matte finish on the sides

Matte finish and blue-gray pearls that go well with each other

The contrast between the mirror and matte finish makes the pearls stand out.

Pearl is a blue-gray semi baroque of 8-8.5mm.

The thick parts have a shiny mirror finish as opposed to the side surface.

1.2 mm plates are crossed and combined at an angle of 60 ° / 120 °.

Uwajima Pearl

Tease Akoya pearls cultivated in the sea of Uwajima.

Some of them couldn't be perfectly round.

However, its blue-gray color and shine. Its beauty is the most beautiful pearl.

To make it, it is necessary to adjust the craftsman's ring according to the shape of each bead.

These pearls are fascinating because they are not suitable for mass production.

* Each semi baroque pearl has a different shape. note that.
semi baroque pearls are a by-product of making round pearls, and the number is limited because they are finished products.

Natural color pearl

This blue-gray color is a natural color that is not dyed or toned, a pearl called "natural".
It is a pearl grown in Mr. Doi's paerl farm in Uwajima, Ehime prefecture in Japan.
* A process called color stop is applied to prevent fading.

Wabori - Japanese Engraving

Option (additional charge + 8,800 yen)

Wabori is a Japanese traditional engraving. 

In ancient times, it was often used as a decorative technique for sword and armor.

Using a cold chisel and a small hammer, each line is engraved by hand.

You can order Japanese engraving as an option at a place about 1/4 on one side.

The engraved part shines brilliantly.

Straight line engraving requires a highly technique.

If you would like to carve the side, please order from this page.If you want to carve it, it will take 7 weeks to complete.

Kosa-Cross engraved ring

Kind of metal

Silver 925

Rhodium coating

Platinum metal rhodium is coated to prevent discoloration.

Nickel is not used.

People involved in the production

For out-of-stock sizes after receiving your order
I will make it

  • We will produce one by one after receiving your order.6 weeks to complete.
  • Please specify the desired delivery date after 7 weeks from the order date and place an order.
  • Check your Ring size 
    If you don't know your ring size or want to know the Japanese size in your country's size, click here.Ring size chart
material Silver 925 rhodium coating Akoya pearl approx. 8-8.5 mm
weight In the case of # 11, Silver925 about 3g
サイズ From #9 to #17 (Japanese size every #2) crossed design makes it difficult to remove even if you specify a slightly larger size.If your normal size is #10/#12/#14/#16/#17, specify one size larger. 
  • There are some differences in the form and color of the pearls.
  • If you make a mistake in your order, we will only cancel or change your order within 6 hours of your order.
  • Items in stock will be returned.Please note that we cannot accept returns for ordered items.
  • In-stock items will be shipped within 3 business days.Items that are out of stock will be manufactured one by one after receiving your order. Please wait 7 weeks.
  • Please specify the desired delivery date 8 weeks after today and place an order.
    * Order mistakes can be canceled or changed only by email within 6 hours of ordering.