KOH

Name: KOH
Address: Taipei, 新北市板橋區, 108, TW
Telephone: +886939990504

Call Directions Website Contact the business

Independent Japanese goldsmith in Taipei
Custom jewelry / Engagement & Wedding rings / Repair
Private studio (by appointment only)
DM to book

04/08/2026

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Where contrast meets harmony.

This ring is crafted from tantalum, inlaid with 18K yellow gold, and finished with a vivid jade centerpiece.

The deep black of tantalum, the rich green of jade, and the warm glow of 18K gold are carefully balanced to create a design that is both clean and contemporary.

Because the ring relies on the natural colors of each material—without any plating or surface coloring—you can enjoy its beauty for years without worrying about fading or peeling.

A timeless piece that celebrates the beauty of authentic materials.

#玉石

28/07/2026

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Where light meets precision.

A delicate line of pavé-set diamonds flows across the surface, creating a subtle brilliance that contrasts beautifully with the clean, mirror-polished platinum.

Crafted in pt950 and finished by hand, every detail is designed to let the harmony between metal and diamonds speak for itself.

Materials : Pt950 / Natural diamonds

21/07/2026

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Two precious metals.
One timeless ring.

The cool brilliance of Pt950 meets the warm glow of 18K gold, creating a subtle contrast that becomes more beautiful with every glance.

Crafted by hand with attention to every detail, this combination ring is designed to be worn and treasured for a lifetime.

Materials : Pt950 / K18YG

16/07/2026

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A rare moment, captured forever.

The newest addition to the Orb Collection.

At its heart lies a carefully selected Garnet in Quartz—a gemstone so rare that only a small fraction of quartz crystals naturally form with a garnet enclosed inside.

Framed in 18K gold and finished with a rose-cut diamond, each piece celebrates nature’s ability to create something truly one of a kind.

No two stones are ever the same.
Just like the person who wears it.

06/07/2026

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Handcrafted SV925 couple rings.

From shaping the metal to the final finish, every step is completed by hand in my studio.

Made with care, designed to be treasured for years to come.

22/06/2026

💎 FROM GEM TO RING 💍

For the first time, Grand River Gems and Goldsmith Koh Nagahata are joining forces to offer a unique private workshop experience.

Create a gemstone.
Create a ring.
Create something truly your own.

Over two one-on-one sessions, you’ll experience the complete journey from gemstone to finished jewelry.

🔹 Day 1 — Gem Cutting & Polishing
Learn directly from Jack (Jack Chong), one of Taiwan’s few internationally recognized Master Gem Cutters and a USFG Grand Master.

🔹 Day 2 — Ring Making & Stone Setting
Work alongside Goldsmith KOH to create a sterling silver ring and set the gemstone you polished yourself.

・Private 1-on-1 instruction
・Learn from two professional craftsmen
・Polish your own Gem
・Create your own sterling silver ring
・Set your own gemstone
・Take home your finished piece

📍 Taipei
⏳ 2 Days / 4–5 hours per day

Limited availability.

DM either Jack Chong or JEWELRYSTUDIO KOH for details and upcoming dates.

💎 FROM GEM TO RING 💍

Grand River Gems 與 Goldsmith KOH 首次合作推出特別課程。

親手研磨寶石，
親手製作戒指，
親手完成屬於自己的珠寶作品。

兩天一對一私人工作坊。

🔹 Day 1｜寶石研磨

由 Grand River Gems / Jack’s Gem Cut Studio 的 Jack 親自指導。

Jack 擁有美國 USFG 最高等級 Grand Master 認證，是台灣少數具國際認可資格的大師級寶石研磨師之一。

🔹 Day 2｜戒指製作

由 Goldsmith KOH 指導純銀戒指製作。

將自己研磨完成的寶石鑲嵌到親手打造的戒指上，完成真正屬於自己的珠寶作品。

・一對一私人教學
・寶石研磨師與 Goldsmith 親自指導
・寶石研磨體驗
・純銀戒指製作
・寶石鑲嵌體驗
・完成作品可直接帶回家

📍 台北
⏳ 兩天課程（每天約 4–5 小時）

歡迎私訊
Jack Chong 或 JEWELRYSTUDIO KOH
了解課程資訊與開課日期。

09/06/2026

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Custom Engagement Ring

Pt950 Platinum × K18 Rose Gold with a 0.5ct Diamond

A balance of strength, warmth, and timeless elegance.

Handcrafted with care.

#珠寶設計

14/04/2026

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Peridot engagement ring
14K gold with marquise diamonds

A vivid green center stone, paired with four marquise diamonds to create a balanced and elegant composition.

Handcrafted with attention to detail, from stone setting to final finish.

#手作珠寶 #ジュエリー

20/03/2026

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A familiar design, reimagined with a lighter presence.

This piece was recreated from a client’s original ring—maintaining the same design while carefully reducing the weight for everyday comfort.

Crafted entirely by hand using the client’s own 24K gold, alloyed in-house into 18K white gold.

Unlike conventional 18K white gold, which often relies on rhodium plating to achieve its color, this piece is made using a palladium-only alloy.
No plating—just a natural white tone that remains consistent over time.

Made to be worn.
Meant to remain.

#訂製戒指 #珠寶設計 #オーダーメイド

17/03/2026

A custom portrait cut Oregon Sunstone / 19.95ct.

A faint schiller,
like clouds drifting in the sky.

No strong color, no bold flash —
just quiet light and depth.

Each angle shifts the view.
A stone to be seen slowly.

Address

Taipei
新北市板橋區
108

Telephone

+886939990504

Website

https://www.jewelrystudio-koh.com/

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