Lab-grown diamonds are real diamonds created in a controlled laboratory environment using advanced technology that replicates the natural diamond-growing process.

Chemically, physically, and optically, lab-grown diamonds are identical to mined diamonds.

The only difference is their origin—lab-grown diamonds are created in a lab, while natural diamonds form in the earth over billions of years.

Absolutely. Lab-grown diamonds are graded and certified by the same independent gemological laboratories that certify natural diamonds, such as GIA and IGI. We offer both.

Lab-grown diamonds offer identical beauty and sparkle while saving you 80–90% compared to natural diamonds of the same quality.

Begin by selecting your preferred diamond from our network of lab-grown diamond suppliers. Next, choose a ring setting from our diverse collection that fits your style. Our easy-to-use design tool lets you visualize and modify your ring until it's perfect.

Unfortunately, we are unable to show you the stone in person as we do not stock the diamond. However, we provide detailed photos and videos for each diamond. For further help, please contact us at support@precious-lab.com.

Our selection includes a variety of styles ranging from classic solitaires and romantic halos to modern bezels and intricate pavé settings. Each setting is designed to enhance the beauty of your chosen lab-grown diamond.

Our custom rings typically ship within 20–25 business days. If there are any changes to the timeline, we’ll keep you updated every step of the way.

We understand plans can change! You can adjust or cancel your order within 3 business days for a full refund. For customized rings, please make any changes within 2 business days. Thank you for your understanding and support.

If you want to change or cancel your order, please contact us here.

Unfortunately, we cannot offer exchanges. If you need a different size or color of an item, you will need to place a new order and return the item that does not fit. If you order the same model again in a different color or size, we can ensure that you can keep any discount that may have been granted on the original order. The returned item will be refunded as soon as it arrives at our warehouse.

You can follow our online guide to measure your ring size accurately at home.

We ship to multiple countries worldwide, including the US, UK, Europe, Asia, and more. Check our full list on the shipping page.

Domestic Deliveries

• We offer free shipping for all domestic deliveries within Japan.
• Local orders are handled by trusted carriers such as Yamato and Sagawa to ensure prompt and secure delivery.
• Once your order is ready, it will typically be shipped within 1-2 business days.

International Deliveries

• For international orders, we partner with FedEx to provide express and insured shipping.
• We offer FREE worldwide shipping on all our products on orders above JPY150,000
• International orders are shipped within 1-2 business days of your order being ready.

We ship worldwide. For domestic orders in Japan, we partner with Yamato or Sagawa. For international deliveries, we use FedEx for fast and reliable service. All orders are insured door-to-door.

Custom rings typically ship within 20–25 business days. Other jewelry pieces including preset rings are typically shipped within 15-20 business days. We’ll keep you updated if there are any changes.

We offer a 14-day return policy for all our rings. If you’re not completely satisfied with your custom ring, you can return it within 14 days for a refund or exchange. Please see our full Refund Policy for more details.

Yes. Every ring comes with a 1-Year Limited Warranty against manufacturing defects. We also provide lifetime free resizing, prong retipping, and polishing, so your ring always looks and feels perfect.

No it's not mandatory. But it is highly recommended. Indeed, it will allow you to find your history, edit your addresses and track your parcel online faster. You will also be notified of new products and special events.

Absolutely not. We never have access to your payment information. All transactions are securely processed by Square, a trusted global payment provider. Your data is completely safe.

We accept the following payment methods:

• PayPal
• Visa
• Mastercard
• American Express
• JCB
• Domestic Bank Deposit