Skydiamond

Skydiamond is a British fine jewellery brand built around one specific claim: its diamonds are grown from carbon pulled out of the air, not mined from the ground and not grown from a standard industrial feedstock either. For a Zurich buyer wading through a category full of firms that all say "lab-grown" and "ethical," that distinction is worth pausing on before it gets filed under the same generic heading as everyone else.

How the diamonds are actually made

Most lab-grown diamond sellers describe their stones simply as grown in a lab, without much detail on where the carbon comes from. Skydiamond is unusually specific about this on its own site: it says it extracts CO2 from the atmosphere, liquifies and purifies it, then grows the diamonds on tiny seed crystals inside a ball of plasma running at about 1,000 degrees Celsius. The company states the water used is captured Cotswolds rainfall and the energy is 100% renewable, supplied by its sister company Ecotricity (also founded by Skydiamond's founder, Dale Vince). All of this happens at a single site, the company's Sky Lab in Gloucestershire, which it describes as the only facility in the world making lab-grown diamonds locally and exclusively from these elements. Whatever you make of the marketing language wrapped around it, the underlying process, air capture rather than a standard reactor feedstock, is a genuinely different starting point from most of the lab-grown competition, and it's the reason this listing sits in the ethical-sourcing half of the category rather than the price-comparison half.

Skydiamond calls the result "carbon negative by design, not offsetting," and its sustainability page goes further, saying the diamonds are "not only carbon-negative but proven to have a better environmental impact than any mined alternative," crediting that comparison to Imperial College London. Worth flagging plainly: no certificate, study link or audit document from Imperial College London appears anywhere on the pages we read, so that verification is Skydiamond's own claim about a third party's work, not something a reader can check for themselves from the site. The same caveat applies to a "GreenCode Global Sustainability Accreditation" badge shown on the homepage: Skydiamond's own blog describes GreenCode as an independent auditor with over 25 years of experience and says the company received an excellent score after a detailed audit, but the page links only to GreenCode's general standards, not to Skydiamond's own certificate or audit report. Both claims may well be accurate, but they are asserted rather than published, and the category description on this page exists precisely because that gap matters: ask for the underlying documentation before it factors into a deposit.

Shipping and duty to Switzerland

The practical question for a Zurich buyer is simpler than the sustainability debate: does the site actually ship here, and on what terms? Switzerland is listed by name in Skydiamond's checkout country selector, in the same long alphabetical list that runs from Afghanistan to Zimbabwe, alongside effectively every other country. That is not a shortlist built for Switzerland specifically, but it does confirm the option exists and it isn't hidden behind a support ticket. One detail worth noting for budgeting: the site shows Switzerland's prices in pounds sterling, not francs, the same as the UK and most non-EU markets, while EU member states like Germany, France and Austria are shown in euros. So a Zurich order runs in GBP and moves with the exchange rate, unlike buying from a Swiss-registered seller.

On duty, the terms are direct: taxes and duties are only included in the price for orders delivered within the UK. For everything else, the price on the site excludes import duties and sales taxes, and the buyer pays these directly to the courier to release the order from customs, a DAP (Delivered At Place) arrangement. Skydiamond recommends checking with your own customs office before ordering since it can't quote the exact amount, and it states plainly that the buyer carries the risk of confiscation en route and is on the hook for return shipping if that happens. None of that is unusual for a UK retailer sending jewellery abroad, but it's worth reading in full before ordering, and it's exactly the kind of published detail that makes this listing possible to write with confidence.

Delivery timing is published in two bands: for ready-made pieces (earrings, bracelets, necklaces), the UK figure is 5 to 7 working days and the international figure is 10 working days. A ring needing the site's complimentary resize takes 4 to 6 weeks domestically and 8 weeks internationally, and a bespoke commission is quoted at 6 weeks in the UK and 8 weeks internationally from the point the final design is confirmed. One thing the site does not spell out is which of its two paid shipping tiers, a 12 pound European rate or a 49 pound flat international rate (both separate from an earlier line promising complimentary UK and Europe delivery, a genuine inconsistency on the page itself), actually applies to a Swiss order. That is a real gap rather than something we're prepared to guess at, so budget for either and confirm the exact figure before you check out.

What you get

The catalog covers engagement rings, wedding bands, eternity rings, earrings, bracelets and necklaces, built entirely around Skydiamond's own stones rather than mixing in mined diamonds. Rings are organised by named collections (Solaris, Onda, Elemental and others), by metal (yellow gold, white gold, platinum, or gold and platinum combinations) and by stone shape, with round brilliant, oval, pear and emerald all offered. Buyers can choose a ready-to-ship ring, request a resize on one, or commission a bespoke design from scratch, and there is a separate loose-stone catalog for anyone who wants to source a certified diamond and set it independently. Every diamond is graded through the Birmingham Assay Office Gemmology Lab under its AnchorCert system, checking the standard 4Cs (cut, clarity, colour and carat weight), with a full laboratory report issued for loose stones. The Assay Office itself is described on the certification page as established 250 years ago by Act of Parliament, and it is a real, independent UK grading authority rather than an in-house lab, which matters for anyone who wants a certificate a Swiss jeweller could later verify or reference.

Consultations and after-sales

Skydiamond runs two physical showrooms, one by appointment in London (180 Studios) and one at the Sky Lab site itself near Stroud in Gloucestershire, both offering complimentary design consultations. There is no Swiss location and the site does not mention a video-consultation option for buyers who cannot get to the UK, so a Zurich buyer planning a bespoke commission should expect the relationship to run over email and phone (a UK landline number, 01453 572059, is published) unless they can visit in person.

After-sales terms are published clearly. Returns and exchanges are accepted within 28 days of purchase if the item is unworn, undamaged and in its original packaging; bespoke and engraved pieces cannot be refunded, and earrings can't be returned once removed from their packaging card unless faulty. Separately, the UK terms and conditions describe a 30 day window to cancel an order from the day it's processed and a 14 day statutory right after delivery, though those specific windows are framed under the UK's Consumer Rights Act 2015, so it isn't published whether the same statutory backing extends to a Swiss buyer the way it would to a UK one. What does read as a straightforward company promise, with no UK-only qualifier attached, is the Extended Warranty: twelve months from purchase, Skydiamond will repair or replace any jewellery or Skydiamond stone that proves defective due to material or workmanship under normal use. Because the pieces are handmade, the terms note a 2% tolerance on stated sizes, weights and measurements.

One more thing worth surfacing rather than glossing over: in April 2024 the UK's Advertising Standards Authority upheld a complaint, brought by the Natural Diamond Council, against some of Skydiamond's marketing wording, ruling that phrases like "real diamonds" and "diamonds made entirely from the sky" needed a clear qualifier such as "laboratory-grown," since the ASA found that a meaningful share of consumers (its own research put it at around 25%) don't know synthetic diamonds exist. It's a labelling ruling about advertising language, not a finding about the product itself or the company's solvency, and Skydiamond has continued trading and posting new content well into 2026 since then, but it's a fair reason to read "diamond" on this site as shorthand for "lab-grown diamond" rather than take the word at face value from an ad alone.

Who it suits and the verdict

This suits a Zurich-based buyer who wants a specific, well-documented growing process rather than a generic lab-grown claim, is comfortable ordering from the UK and paying Swiss import duty on delivery, and doesn't need to try a ring on in Switzerland before committing. It suits someone planning ahead rather than shopping for a same-week ring, given the resize and bespoke timelines run to 8 weeks internationally. It's a weaker fit for a buyer who wants prices quoted in francs, a definite answer on the shipping fee before checkout, or a nearby showroom to visit in person. The certification through the Birmingham Assay Office is independently checkable and genuinely reassuring, the twelve-month warranty is a clear, unconditional promise, and the carbon-capture story is real and well explained on the company's own pages, even where its broader sustainability claims lean more on the company's own word than on linked, independent proof. Read the fine print on duty and the shipping tier before ordering, and this is a legitimate, well-documented option for the specific niche it occupies.