Just in time for the holiday season, a new ring has arrived. This slender signet ring features a single baguette-cut diamond. The diamond is set straight along the face of the signet, with the setting kept as minimal as possible. The straight line of the diamond and the surface of the metal complement each other, creating a refined nuance on your hand.

Designed to blend seamlessly into your everyday life, this ring reveals a quiet brilliance with high clarity when you glance at it—a minimal design that breathes artisanal precision into a sense of calm. It looks beautiful worn alone or stacked with other rings.

▼ Baguettecut Diamond Ring_signet
https://cobaco.shop/products/053

The holiday season has finally arrived. At cobaco, the Holiday Season 2025 collection launches today, November 1st. We have prepared many plans this season, including the season-limited collection, exclusive items for this season, and new item releases throughout the season... We will make this season exciting.

1. Season-limited collection "Choose Your Diamond" order reception begins

2. New season-limited items debut

3. Holiday season-related columns now available

4. Event participation scheduled

5. Season-limited wrapping available

A new item has been added to the Jewelry with a choice of birthstones collection. Orders will be accepted starting today, Friday, October 10.

- Birthstone Ring_cone

- Birthstone Ring_vase

When looking at a white porcelain vase, one can feel a tension stretched within the stillness. The shape made to receive something seems beautiful because it is not complete in itself. I have long been drawn to that presence.

While embracing empty space, it maintains "room for something to be born." This ring was created from the desire to capture that stillness and tension in a small piece of jewelry. A tiny birthstone is set at the top, like the opening of a small vase extending from the arm.

The original atelier coat has been updated to an even more refined design. This season's batch has arrived from the daily wear brand "FRANCESCA AMAM LABEL," who we commission for production. We also use these coats as our workwear, and we find that their relaxed shape still carries an air of elegance, helping us feel composed every time we put them on.

Sales start today, Monday, September 1. Available in limited quantities, so please order soon if you're interested.

▼Drop Sleeve Atelier Coat
https://cobaco.shop/products/049

An ear cuff focusing on the iconic shape born from the concept of the "Staple" collection. Until now, it was only available in gold color, but this time a silver type has been newly introduced.

▼Silver Ear Cuff_staple
https://cobaco.shop/products/040_03_02

New natural stones have been added to the "Decorative Natural Stones" collection.
The crystals, such as kyanite with beautiful shades of blue, tourmaline in its raw form, and rutile quartz mixed with hematite... each one formed over a long period by the great forces of nature, is unique and unlike any other.

▼Collection｜Decorative Natural Stones
https://cobaco.shop/collections/mineral_specimens

The bracelet from the Staple_PLAY collection. In addition to S/M/L sizes, the highly requested XL size is now available. You can now choose from four sizes.

Applicable items:
Silver Chain Bracelet_staple
Gold Colored Bracelet_staple
*XL size is a paid option only

Collection:
Staple_PLAY


[ Update: 2025/9/26 ]
From 9/26, we have updated the size labels and prices for each size.

S size → Discontinued
M size → Changed to new S size
L size → Changed to new M size
XL size → Changed to new L size

Please note that the content above differs from the current information. Thank you for your understanding.

Inspired by the U-shaped nails called "Kasugai (Staple)" used to bind building materials, the "Staple" collection was created. By extending, shortening, and linking the delicate ridges of the stone-setting parts, we focused on the iconic form that embraces natural stones. While exploring various possibilities, another collection that playfully captures this essence with a light touch, "Staple_PLAY," was born.

Starting today, Friday, May 23rd, now available. You can view it on our online store.

▼Collection｜Staple_PLAY
https://cobaco.shop/collections/staple_play

The "Staple" collection allows you to fully enjoy the charm of carefully selected large natural stones. In addition to the random shapes that have been the main focus so far, an oval shape has now been introduced. This classical and elegant shape highlights the beauty of natural stones from a different perspective than the random shapes.

Sales start today, Friday, May 9. Available for viewing on the online store.

▼Collection｜Staple
https://cobaco.shop/collections/staple

Starting today, Friday, April 25, new seasonal gemstones have been added to the 'Staple' collection.
Vivid blue Sea Blue Chalcedony and eye-catching Lemon Quartz in a refreshing yellow are among the natural stones newly added, perfect for the coming season. Please take a look.

▼Collection｜Staple
https://cobaco.shop/collections/staple

The atelier coat that we have long loved as our workwear. Based on what we have felt while actually wearing it, we decided to reevaluate it.

We have once again commissioned the daily wear brand "FRANCESCA AMAM LABEL," which uses high-quality domestic cotton fabric and is crafted by skilled artisans. While utilizing the strengths of the previous atelier coat, it has been updated to a more refined shape.

The piece features stone-setting parts designed in the "Staple" collection, adding subtle details unique to a jewelry brand. After two years of development, a piece that suits the current mood has been completed.

▼Drop Sleeve Atelier Coat
https://cobaco.shop/products/049

▼[ Column ] New workwear born in the atelier
https://cobaco.shop/blogs/column/050

▼[ Column ] Styling Sample | Drop Sleeve Atelier Coat
https://cobaco.shop/blogs/column/051

From January 24th (Friday), new natural stones will be added to the collection 'Staple'. In addition to the standard bicolor smoky quartz and rutile quartz, rare natural stones such as hawk's eye, which has a unique gray-blue luster, are also selected. Please take a look.

▼Collection｜Staple
https://cobaco.shop/collections/staple

The items that received great acclaim at the recent event "New Jewelry TOKYO 2024" held in Omotesando, Tokyo, are now available in our online store for a limited time starting today. These earrings feature iconic K18YG parts with laser hole diamonds (0.11ct) at the tips, born from the concept of the "Staple" collection. You can fully enjoy the brilliance of the diamonds swaying at the delicate ridges.

Micro diamonds with a diameter of less than 1mm are individually set by skilled artisans using a microscope. This season, we introduce a diamond ring with an asymmetrical design where the curves of the ring arm converge at one point. It will be available for purchase on the online store starting November 15th.

Item: 
Micro Diamond Ring_asymmetry

The holiday season has finally arrived. At cobaco,November1 dayThe Holiday Season 2024 launch is starting. We have a season-limited collection, exclusive items for this season, and new item releases throughout the season... We have many plans in store for this season as well. Let's make the season exciting!

1. Seasonal Limited Collection 'Choose Your Diamond' Order Now Open

This season, we are introducing the limited edition collection "Choose Your Diamond." We will deliver five special diamonds, including four diamonds with different cuts—Round Brilliant Cut, Rose Cut, Emerald Cut, and Princess Cut—along with a seasonal exclusive, all crafted into stunning combination color jewelry.

2. Limited Edition Items for This Season

The seasonal collection "Selectable Diamonds" introduces a limited edition item for this season. The brown diamond, with a color reminiscent of poured brandy, is given a cushion cut for an antique appearance. The stone setting is made of platinum, while the band is crafted from K18 yellow gold, creating a combination color ring. As this is a limited quantity item, sales will end once the prepared brown diamonds are sold out.

3. New items are now available this season.

Skilled artisans set each micro diamond with a diameter of less than 1mm using a microscope. This season, we introduce a diamond ring with an asymmetrical design where the curves of the ring arm converge at a point.

Item:
Micro Diamond Ring_asymmetry

4. Holiday Season Related Column Now Available

Introducing our holiday season limited collection "Choose Your Diamond," along with a selection of jewelry that will brighten this season. Here are some coordination samples for stacking wedding rings with items from the collection. 

[ Column ] Styling Sample｜Holiday Season 2024
https://cobaco.shop/blogs/column/047

For those looking for a gift for a loved one. We will pick up recommended items.

The limited holiday season collection "Choose Your Diamond" features diamonds with various cuts, ranging from those devised in the 16th century to those developed in recent years. In this column, we will explore the history and characteristics of each cut.

Holiday season limited collection "Choose Your Diamond" column "Four Sparkles, Four Perspectives." We will introduce the characteristics of four diamond jewelry pieces from several angles, including differences in sparkle, form, and craftsmanship.

5. Limited Edition Holiday Season Wrapping Available

The packaging for delivering jewelry will also be a limited edition for the season. During this period, all customers who purchase jewelry (excluding some items) will receive a holiday tag in a grayish color. The tag, made from a special paper material with a metallic pearl finish, reveals a dazzling luster like an aurora depending on the angle, and can also be used as a message card.

6. [ Event ] Participation in New Jewelry TOKYO 2024 has been confirmed

We are pleased to announce our participation in "NEW JEWELRY TOKYO 2024," the largest designer jewelry event in Japan, which will be held from November 29 (Friday) to December 1 (Sunday) at Spiral in Aoyama, Tokyo. This will be the only opportunity to meet with everyone in the Kanto region during this season. We look forward to your visit with exclusive items and special projects prepared for the event.
Further details will be provided in future blogs and newsletters.

9月20日（金）、Collection 'Jewelry with a choice of birthstones'New items have been added.

‐ Birthstone Ring_signet

The signet ring (seal ring), which has a long history that dates back to ancient times, can be traced back to before the common era.Traditionally engraved family crests and initials of the wearer have been replaced with tiny birthstones. You can choose the number of birthstones to be set, from 1 to 5 stones.

‐ Birthstone Ring_asymmetry

The asymmetrical form created by the converging curves towards one corner. A tiny birthstone is set on its side, facing the wearer.

-

To commemorate the addition of a new item to the 'Jewelry with a choice of birthstones' collection, we are holding a small gift campaign. For more details, please see the blog below.