Frequently Asked Questions (FAQ)

The chemical composition is identical: pure crystallized carbon . It is not possible to see the difference with the naked eye ; only a gemological laboratory can distinguish them.

The difference comes from the origin . Natural diamonds are formed underground, while lab-grown diamonds are man-made under controlled conditions.

Their price, environmental impact, and market value also differ. We explain everything here .

Our natural diamonds come mainly from Southern Africa (Botswana, Namibia, South Africa) and Canada. Given the current geopolitical context, we do not offer any diamonds of Russian origin . All our stones are certified and sourced in compliance with the Kimberley Process , guaranteeing rigorous traceability and the absence of conflict financing.

Our laboratory diamonds are created using cutting-edge technologies (HPHT or CVD) in specialized laboratories, mainly located in the United States , Europe and Asia .

Yes, absolutely. In addition to the stones presented online, we have a large network of partners and can offer, upon request , diamonds perfectly suited to your needs:

Exceptional stones of more than 2 carats , rare cuts , or even melee stones intended for jewelry professionals.

Let us know what you're looking for: we'll get back to you quickly with a tailor-made selection .

Each Diamstar diamond is carefully presented in a case , accompanied by its certificate of authenticity in paper format as well as a GIA explanatory brochure .

The whole thing is then shipped in a neutral package , with no apparent mention of the nature or value of the contents, in order to guarantee discretion and security upon delivery.

Yes, absolutely (except melees). We even offer dual certification, both paper and digital .

Each diamond, whether natural or synthetic, is accompanied by its paper certificate of authenticity, issued by a recognized independent laboratory (GIA, IGI or HRD). This document details all the characteristics of the stone (serial number, 4C, proportions, fluorescence, etc.).

Also, at Diamstar, we've chosen to innovate and also offer you a free digital certificate in NFT format stored on the blockchain. More information here.

Your diamond, whether natural or lab-grown, comes with its certificate of authenticity issued by an independent gemological laboratory .

This document details all the characteristics of the stone (serial number, 4C, proportions, fluorescence, etc.).

The simplest and most reliable way is to check, using a magnifying glass, that the serial number laser engraved on the girdle of the stone corresponds to the number on the certificate.

To verify the authenticity of your gemological certificate, simply visit the website of the corresponding laboratory and go to the “Report Check” section.

Enter your certificate number to access its official version, usually available as a downloadable PDF.

• GIA certificates: click here
  
• HRD certificates: click here
  
• IGI certificates: click here
  

Each diamond purchased from us comes with, if you wish, a unique digital certificate (NFT ), recorded on the Ethereum blockchain.

This exclusive DIAMSTAR certificate attests to the authenticity, traceability, and ownership of your stone. You can learn more here.

Not necessarily.

If you already have a wallet (e.g., Metamask), you can send us your address when you check out. You will then automatically receive your NFT certificate in your wallet after the 14-day cooling-off period.

Otherwise, we will email you a simplified version accessible via a secure link, which allows you to view the document online. We also keep and archive your order history. If you decide to create a wallet in the future , simply contact us and we will send you the NFT certificate. More explanations here .

Directly from our website, or by filling out our personalized support form to guide you in your choice. You can also contact us for a specific request or a custom stone.

To order a custom engagement ring from DIAMSTAR, simply follow these steps:

First, configure your ring setting using our configurator by selecting your preferred options, including the diamond shape, ring style, setting, metal, gold purity, ring size, and more. Once your configuration is complete, add the ring setting to your cart.

Next, choose your certified diamond from our selection of natural or laboratory-grown diamonds and add it to your cart as well.

Your order will therefore include two items: a custom-made ring setting and a certified diamond.

Once your order has been confirmed, our team will carefully match your selected diamond with your ring setting and professionally set the stone in our workshop before shipment.

You will receive a fully finished engagement ring, ready to be presented, together with your diamond’s grading certificate.

We offer complimentary shipping to mainland France and across the following European Union countries:

Germany, Austria, Belgium, Bulgaria, Cyprus, Croatia, Denmark, Spain, Estonia, Finland, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Poland, Portugal, the Czech Republic, Romania, Slovakia, Slovenia, and Sweden.

We also provide complimentary international shipping outside the European Union to the following destinations:

Canada, the United States, Hong Kong, Japan, Monaco, the United Kingdom, Singapore, and Switzerland.

Please note that, depending on the destination country, additional charges such as import duties, local taxes, and customs clearance fees may apply and remain the responsibility of the customer.

We may also ship to countries not listed above upon request, subject to prior review and approval by our team. For any inquiries regarding shipping, please contact us at info@diamstar.co.

The choice of carrier depends on both the order value and the shipping destination .

We work mainly with Chronopost , FedEx or DHL, and for the most valuable pieces, with a carrier specializing in the transport of precious items.

In all cases, your package is shipped with full tracking and insurance appropriate to its value , to guarantee safe delivery.

To offer you a wide selection of diamonds at highly competitive prices, we work with carefully selected suppliers from around the world.

Delivery times may vary depending on the nature of the products ordered, their origin, and your delivery destination.

Certified Diamonds (Natural & Lab-Grown)

• Metropolitan France: approximately 5–10 business days
• European Union, Monaco, United Kingdom and Switzerland: approximately 6–12 business days
• Outside the European Union: approximately 10–15 business days

Custom Jewelry

Engagement rings, tennis bracelets and earrings created using our configurators are made exclusively to order.

Estimated production and delivery time: approximately 20–30 business days, regardless of the destination.

It depends on the country of delivery :

• For France and the European Union , no customs fees are expected.

• Outside the EU, customs duties or import taxes may apply according to local legislation. The customer is then responsible for these upon receipt.

We ship each package with the necessary customs clearance documents to facilitate the process and limit possible delays.

FRANCE & EUROPEAN UNION

Certified Diamonds

In accordance with applicable consumer protection laws, you have 14 days from the date you receive your order to exercise your right of withdrawal.

Before returning any product, please contact our Customer Service at:

info@diamstar.co

All returned diamonds are subject to a prior inspection to verify the integrity of the diamond, its grading certificate and its presentation box.

A refund will only be issued if the returned product is received in its original condition.

Return shipping and insurance costs remain the sole responsibility of the customer.

Melee & Pavé Diamonds

The melee and pavé diamonds offered by DIAMSTAR are prepared, calibrated and packaged exclusively to order according to the specifications of each purchase (size, color, clarity and quantity).

Due to the customized nature of these products, their traceability requirements and quality control procedures, return requests for melee and pavé diamonds can only be accepted on an exceptional basis and subject to DIAMSTAR’s prior approval.

Any approved return must consist of a complete lot that is:

• unused;
• unhandled;
• kept in its original sealed parcel paper;
• submitted for a full gemological and quality inspection.

DIAMSTAR reserves the right to refuse any return showing signs of handling, alteration, use, opening of the sealed parcel paper, mixing with other goods, or any inconsistency with the original shipment.

Custom Jewelry

Engagement rings, tennis bracelets and earrings created using the DIAMSTAR configurators are manufactured exclusively to order according to the options selected by the customer (diamond shape, setting style, metal, gold color, size, engraving, and other available customizations).

In accordance with Article L221-28 of the French Consumer Code, these products are made to the customer’s specifications and are clearly personalized. Therefore, they cannot be returned, exchanged or refunded, except in the event of a manufacturing defect or if the delivered product does not conform to the order.

If you have any questions or require assistance, please contact our Customer Service at:

info@diamstar.co

OUTSIDE THE EUROPEAN UNION

All orders are considered final once shipped and cannot be returned, exchanged or refunded.

As products are shipped internationally, customs duties, local taxes and customs clearance fees may be charged by the destination country. These charges remain the sole responsibility of the customer.

If the customer refuses to pay these charges, any returned shipment will not be eligible for a refund.

Yes, under certain conditions.

Orders for certified diamonds may be cancelled provided they have not yet been shipped from Paris.

Custom jewelry may only be cancelled before production has begun. Once manufacturing has started, the order can no longer be cancelled due to the personalized nature of the product.

If you wish to modify or cancel your order, please contact us as soon as possible at info@diamstar.co.

We accept payments by bank transfer and credit card (CB, Visa, Mastercard, American Express, Apple Pay) via our secure Stripe payment platform.

This service is not yet offered on our website, but we are actively working to offer this option to you in the near future.

In the meantime, please do not hesitate to contact us: we will do our best to find a solution adapted to your situation.

Yes. Jewelers, designers, brands: we also meet the needs of professionals by offering a wide range of diamonds, from melee to exceptional stones, and tailor-made expertise .

Each request is carefully studied, we adapt to your specifications , your constraints, and guarantee quality control . Please contact us at info@diamstar.co to discuss your project.