Final Ring | Craft Yours Now

US size ↔ Japan size (Precious Lab) with inner diameter (mm)
US Size	Japan Size	Inner Diameter (mm)
3 ¼	5	14.3
3 ½		14.5
3 ¾	6	14.7
4		14.9
4 ⅛	7	15.0
4 ½	8	15.3
5	9	15.7
5 ⅜	10	16.0
5 ¾	11	16.3
6 ¼	12	16.7
6 ⅝	13	17.0
7	14	17.3
7 ½	15	17.7
7 ⅞	16	18.0
8 ¼	17	18.3
8 ¾	18	18.7
9 ⅛	19	19.0
9 ⅜	20	19.3
9 ⅞	21	19.7
10 ¼	22	20.0
10 ⅝	23	20.3
11 ⅛	24	20.7
11 ½	25	21.0

Create A Truly Bespoke Ring

Customize rings using hand-picked lab grown diamonds from Japan’s top sources. Choose your cut, setting, and metal to create a ring that’s uniquely yours.

Trusted Advice

Over 30 years of experience in Japanese jewelry craftsmanship, our jewelers provide personalized consultations on diamond selection and custom designs.

Buy With Confidence

Shop our certified selection of lab grown diamond jewelry with transparency, detailed specifications, and lifetime guarantees.

Sourced With Care

Every diamond is crafted with sustainability and ethical practices in mind—because luxury should never come at the planet’s expense.

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The Perfect Ring

Jewelry for Every Style

The Perfect Ring

Jewelry for Every Style

Three decades of expert artistry creating jewelry with timeless beauty and lasting quality.

The Perfect Ring

Jewelry for Every Style

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The Perfect Ring

Jewelry for Every Style