Celebrate Love with Diamonds

Engagement Ring Collection

Explore our engagement ring collection, crafted in Japan with certified lab-grown diamonds. From classic solitaires to unique designs, each ring reflects love, sustainability, and refined craftsmanship.

A ring that’s one of a kind

Design Yours Now

Choose your diamond, pick the setting, pick your diamond, and add personal details. Our ring builder makes it simple to design a one-of-a-kind ring, crafted in Japan.

Solitaire
Solitaire
halo
halo
pave
pave
Unique
Unique
Three Stone
Three Stone

from precious lab

Why Choose a Lab-Grown Diamond Engagement Ring in Japan?

At Precious Lab, we believe your engagement ring should reflect both your love and your values. That’s why we specialize in lab-grown diamond engagement rings in Japan—crafted with precision, beauty, and responsibility.

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Ethical & Sustainable

Unlike mined diamonds,lab-grown diamondsare created in controlled environments, free from environmental damage and unethical practices. By choosing alab-grown engagement ring, you’re embracing a more sustainable future.

igi & gia certified

Certified Quality

Every center stone comes with an IGI certificate of authenticity, ensuring that your diamond’s brilliance, cut, and clarity meet international standards. Our Japanese craftsmanship guarantees a flawless setting for your chosen design.

made in japan

Custom Made for You

From classic solitaires to modern halo designs, our collection allows you to personalize every detail. With Japan’s largest selection of lab-grown diamonds, you can create an engagement ring that is truly unique.

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Based in Tokyo, Japan

As a Tokyo-based jewelry brand, we provide a seamless online shopping experience for customers in Japan and worldwide. Fast shipping, insured delivery, and luxury branded packaging make your purchase worry-free.

FREQUENTLY ASKED QUESTIONS

Can Lab-Grown Diamonds Be Used In Engagement Rings?

Yes — lab-grown diamonds are identical to natural diamonds in brilliance, durability, and composition. They are the perfect choice for engagement rings, offering beauty and value without compromise. In fact, in the U.S., over 50% of engagement rings in 2024 featured lab-grown diamonds, showing their growing popularity worldwide.
How Long Does It Take To Make A Custom Engagement Ring?

Each custom engagement ring is carefully crafted in Japan and typically takes 20–25 business days. If you prefer a preset design, we also offer faster options that are ready to ship in 15–20 business days.
Are Lab-Grown Diamonds Certified?

Yes. Every center stone in our engagement rings comes with an independent grading certificate (such as IGI or GIA). This guarantees transparency on the diamond’s cut, color, clarity, and carat weight.
How Do I Choose The Right Engagement Ring Style?

From timeless solitaires to sparkling halo designs, each style highlights your diamond differently. We recommend thinking about your partner’s lifestyle and preferences. Our Ring Builder Tool makes it easy to explore different settings, metals, and diamond shapes until you find the perfect match.
How Do I Find The Right Ring Size?

We provide a ring size guide with international conversions (Japan, U.S., and Europe). If you’re unsure, we recommend discreetly measuring an existing ring or asking a close friend for help. We also offer a lifetime free resizing service for added peace of mind.
Why Should I Choose A Lab-Grown Diamond Over A Natural One?

Lab-grown diamonds offer:

  • Better value: Get a larger or higher-quality diamond for your budget.
  • Sustainability: No traditional mining, less environmental impact.
  • Transparency: Every diamond is certified and conflict-free.

Natural diamonds still carry a sense of rarity and tradition, but more couples today prefer lab-grown for their modern values and affordability.