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Lab-Grown Diamonds

What is a lab-grown diamond?

A lab-grown diamond is just that, a diamond. It consists of carbon atoms with the same crystal structure, chemical composition, and optical and physical properties as a mined diamond.

A lab-grown diamond is a fantastic feat of technology. First, a diamond seed is placed in a sealed chamber and heated to around 800 degrees Celsius. Next, the chamber is filled with a carbon-rich gas, breaking molecular bonds. Finally, pure carbon adheres to the seed and crystallises, forming a diamond with the same scintillation, flash, fire, and brilliance as earth-extracted diamonds.

What’s the difference between mined and lab-grown diamonds?

The only difference between mined and lab-grown diamonds is that a lab-grown diamond is created under controlled conditions. This allows for a more transparent supply chain and reduces carbon footprint.

Lab-grown diamonds have no nitrogen in the lattice and are classified as Type IIa. Diamonds entirely devoid of impurities are rare, and only 5% of all mined diamonds can compare.

Are lab-grown diamonds more sustainable?

For every carat, a mined diamond requires 7300 litres of water and emits 160kg of CO2. This is drastically high compared to just 1 litre of water and 12kg of CO2 for each carat grown in a lab. (Trucost Report 2017). Therefore, creating our jewels exclusively with lab-grown diamonds is a conscious choice. Moreover, all Unsaid diamonds are grown at our lab, ALTR Tech in Surat, India, and are powered with renewable energy.

Where are Unsaid diamonds grown, and do they come with a certificate?

All our jewels are designed and crafted at our state-of-the-art facilities in India. In addition, our parent company, Walking Tree, has over 100 years of combined experience in diamond cutting, designing and crafting jewels, a savoir-faire that we have brought to Europe in the form of Unsaid.

Our diamonds are grown in our Surat, India lab before being taken to our Mumbai factory, where we have been cutting diamonds for three generations. Our local artisans bring decades of knowledge and passion to every Unsaid diamond, pushing boundaries yearly.

Every round diamond weighing 0.5 carats or more comes with a diamond certificate with H+ colour and VS+ quality. The certificate is issued by the International Gemological Institute (IGI), an independent laboratory and official organisation. This veritable identity card indicates your diamond's composition of the 4Cs while providing supplementary information.

What are the 4Cs?

The 4Cs—colour, clarity, cut, and carat weight—are the globally accepted standards for assessing the quality of a diamond.

Colour: refers to the natural tint inherent in white diamonds. Most white diamonds have a slight shade of yellow, and diamonds come in various colours.

Cut: refers to how a diamond’s facets interact with light and are the only criteria that depend entirely on human hands. The cut enhances all of a diamond's qualities and reveals the perfect balance between brilliance, fire, and scintillation.

Clarity: refers to the number, size, position, and colour of the inclusions visible in the stone under a 10x magnifying glass. The more inclusions there are, the less clarity and value of the stone since inclusions affect the diamond’s ability to reflect light.

Carat: refers to the weight of a diamond, not the size. One carat equals 0.20 grams, which has been an international standard unit of measurement since 1907. The word "carat" comes from the seeds of the carob tree, used in antiquity to measure the weight of a diamond.

Shipping & Delivery

To which countries does Unsaid offer shipping?

Unsaid offers complimentary worldwide delivery except for China currently. Please note we cannot make deliveries to all PO boxes, hotels and campuses.

How does Unsaid ship, and what is the cost?

DHL is Unsaid’s preferred global courier service, offering complimentary shipping on all standard deliveries. All shipments to countries in the European Union, United Kingdom, and Canada are sent with delivery duty paid (DDP). Please refer to local import tax and duties regulations for shipments to all other countries. Your shipment is fully insured through DHL and requires a signature upon delivery. However, our insurance no longer covers your parcel once it is delivered and signed for.

When will I receive my order?

Unsaid delivers in-stock items within 3-5 working days. Different delivery times apply for all made-to-order and personalised pieces, and information will be available during check-out.

Can I change my delivery address?

Once the order is confirmed, you can no longer change the delivery address yourself. If you need to change the delivery address, please email our Customer Service team at with your order number and the updated delivery address.

I placed an order but haven’t received my package. What can I do?

Please allow 3-5 working days for all standard shipments. Once your order is sent, you will receive an email with all shipping and tracking details. If you haven’t received an email or have any other issues, please email the Unsaid Customer Service team at

Returns & Exchanges

What is your refund and exchange policy?

If you wish to return or exchange a product you must notify the Unsaid Customer Service team at within 14 days of receiving the product. Any custom-made and engraved items cannot be refunded or exchanged. Separately, each standard purchase can only be exchanged once.

Unsaid submits all returned products to a strict quality check. The jewellery must not be worn and should be in its original box with the certificate of authenticity and receipt. Please ensure the product is protected when returned. The original payment method will be refunded if your return meets the quality check. Unsaid refuses refunds for items not returned, incomplete, or in any condition other than original. For those wishing to exchange, if your return meets the quality check you will receive a new product or a gift card.

Unsaid provides free DHL return labels for customers in the European Union and the United Kingdom. For all other countries, please contact a local carrier to arrange your return. If purchased at an Unsaid store, you may exchange the product at the nearest Unsaid store within the country of purchase.

Please return the product(s) to the below address:

Unsaid Jewels

De Burburestraat 20

2000 Antwerp


How can I track the status of my return?

To track your return shipment, refer to the tracking number provided by your carrier or email the Unsaid Customer Service team at to check your return status. Unsaid submits all returns to a strict quality assessment. If your return passes our quality assessment, we will issue your refund within 3-5 business days.

What if the jewel is defective?

We replace defective jewels free of charge. Email our Customer Service team at with a detailed description of the issue within 14 days of receiving the jewel to notify us of any faults.

Why was my return/exchange not accepted?

Unsaid submits all jewellery to a strict quality assessment. The jewellery must be in unworn condition. Damaged or soiled items that reasonably suggest the jewel has been worn will be denied a refund or exchange. Our Customer Service team will inform you if your return meets our quality assessment. Additionally, any made-to-order or engraved jewellery cannot be exchanged or refunded.

What if I ordered the wrong piece or size?

Please notify the Unsaid Customer Service team at within 14 days from the date the product is received if you wish to exchange it for another product or size.

An item can only be exchanged once. Personalised and engraved items cannot be exchanged or refunded. Please refer to our Exchange & Returns policy for more details.

Online Orders

How can I place an online order?

To place an order, add a product to your cart by clicking the “Add to Cart” button on the selected product page. Once you have chosen your item(s), complete your order by clicking on the cart icon and proceeding to check out. You can modify or validate your cart and select the delivery method before payment.

Can I change my order after it’s been confirmed?

Once you’ve placed your order, you can no longer make changes or additions to it. Please see our section below for information on our return and exchange policy.

How can I reset the password for my Unsaid account?

Click the link  “Forgot Your Password?” and enter the email address associated with your account. You will then receive an automatic email to help you reset your password. Your Unsaid account is where you can share wishlists and view your order history.

Sending a gift?

Unsaid takes every effort to make each jewel special and unique, down to the moment it’s wrapped. All jewels are wrapped in Unsaid’s signature packaging and can be even more precious with a personalised engraving on select styles or a handwritten note.

Please note: invoices are not included in the packaging. Your order confirmation with proof of payment is received digitally first, and once shipped, is your invoice shared via email.

If the recipient of your gift wishes to exchange the item, they should contact our Customer Service team at where they will be delighted to guide them through the process. Please note that custom-made or engraved items cannot be refunded or exchanged.


Which payment methods are accepted?

CB, Visa, Eurocard, MasterCard, American Express and Paypal are all acceptable payment methods at Unsaid.

Is it safe to use my credit card online?

All personal information is handled with strict confidence, and every transaction on our website is secure. In addition, an SSL encryption system is in place to protect personal data and payment information, and we never save any credit card information.

We reinforce the security of payments through a 3D Secure system for cards equipped with this system. Please contact your bank directly for any questions regarding your 3D Secure system code or process.

When will the payment be debited from my account?

Your bank account is debited as soon as your purchase is confirmed.

Is it possible to charge a single order to multiple cards?

No. All orders must be paid in full via a single payment method.

Product Information and Care

Does my jewellery come with a certificate?

All Unsaid jewels come with a jewellery certificate which details the specifications of the jewel. To avoid counterfeits, we strongly suggest you always purchase your jewellery from an Unsaid store or authorised retailer.

Every round diamond weighing 0.5 carats or more comes with a diamond certificate with H+ colour and VS+ quality. The International Gemological Institute (IGI), an independent laboratory and official organisation, issues each Unsaid certificate.

How do I choose the right size for my Unsaid jewellery?

If you are unsure about sizing, please look at our Sizing Guide before placing your order.

Our expert team is also available to give advice. You can email us at, call +33 6 95 11 99 76 or book a virtual appointment Tuesdays to Saturdays, 10 am - 5 pm.

Why should I have my Unsaid jewellery serviced?

Regular maintenance is the best way to ensure the longevity of your precious jewels. In everyday use, your jewellery might be subject to stress, such as bumps, scratches, UV radiation, dust, sweat, and fluctuations in temperature. For this reason, we recommend you have your jewellery cleaned and serviced every three years by bringing it to one of our stores or an authorised distributor.

Unsaid offers a range of repair services for any products purchased in our stores, from, and via authorised distributors. For repairs, deposit your Unsaid jewellery in our after-sale services (care services) in our stores where we will systematically repair them in our workshops by our artisans.

The “Our store” section on allows you to locate your nearest store. If you do not have an Unsaid store near you or you cannot travel, please contact our Customer Service team by email at

How do I take care of my jewellery at home?

Handle your jewellery carefully to keep its beauty and brilliance. Protect your jewellery from being scratched against hard surfaces and sudden movements that could cause damage to the stone or setting. Store your jewels in its Unsaid box to avoid scratching and entangling.

We recommend removing all jewellery when doing household chores as repeated contact with detergents and bleach can damage precious metals, also before engaging in sports or getting in contact with water.

To clean a stone or a diamond pavé, use a mild non-abrasive cleaner and a soft toothbrush under hot water to gently remove dirt without damaging the jewellery.

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