The One: 1ct Lab-Grown Diamonds
1ct lab-grown diamonds · 9ct yellow gold
The One Collection
One stone. Five shapes. Entirely yours.
The One is our 1ct collection: a single, beautifully proportioned lab-grown diamond, bezel-set in 9ct yellow gold as a ring, a pendant or a pair of studs. Choose your shape, choose your piece, and wear a full carat every day — from £449.
- Lab-grown diamond
- 1.00ct
- Colour grade
- D/E
- Clarity grade
- VS1-2
- Yellow gold bezel
- 9ct
Choose your shape
Each shape is available as a ring, a necklace and stud earrings.
Emerald cut
1ct Emerald Cut Lab-Grown Diamond Jewellery
Long, clean step-cut facets and a hall-of-mirrors flash rather than confetti sparkle. The emerald cut is the quietly architectural choice — sleek, modern and endlessly wearable.
Oval cut
1ct Oval Lab-Grown Diamond Jewellery
An elongated outline that lengthens the finger and carries a lot of presence for its carat weight. Oval keeps the fire of a brilliant cut with a softer, more contemporary line.
Pear cut
1ct Pear Cut Lab-Grown Diamond Jewellery
A teardrop that pairs the brilliance of a round with a graceful point. Pear is distinctive without being fussy, and it looks striking as a pendant or a stud.
Heart cut
1ct Heart Shaped Lab-Grown Diamond Jewellery
The most romantic of the fancy shapes, cut with real precision so the cleft stays crisp and the stone stays bright. A meaningful gift, and a piece to keep.
Round Brilliant cut
1ct Round Brilliant Lab-Grown Diamond Jewellery
The classic. A round brilliant is cut to return as much light as a diamond can, which makes it the most sparkling of the five and the easiest to wear every day.
The detail
The One at a glance
Every piece is 1.00ct total lab-grown diamond weight, D/E colour, VS1-2 clarity, bezel-set in 9ct yellow gold. On the earrings, the carat weight is shared across the pair.
| Shape | Ring stone | Pendant stone | Each earring stone |
|---|---|---|---|
| Emerald | 6.9 x 4.8mm | 7 x 4.8 mm | 3.8 x 5.4mm |
| Oval | 8.45 x 5.75mm | 8.3 x 5.8mm | 6.4 x 4.5mm |
| Pear | 4.4 x 6.8mm | 9.1 x 5.6mm | 4.4 x 6.8mm |
| Heart | 6.2 x 7mm | 6.3 x 7.11mm | 5 x 5.5mm |
| Round Brilliant | 6.5mm | 6.5mm | 5.2mm |
Rings are offered in UK sizes J/K, L/M, N/O, P/Q, R/S. Not sure of yours? Use our ring size guide.
Why lab-grown
A full carat, without the mined-diamond premium.
Lab-grown diamonds are real diamonds — optically, physically and chemically the same as mined stones, and different only in where they began. That means the fire, the hardness and the colourless clarity you expect from a 1ct diamond, at a price that reflects the stone rather than the mining and the marketing.
Every stone in The One is graded D/E colour and VS1-2 clarity, so what you see on the page is what arrives.
Free tracked UK delivery
Insured and typically with you in 3–5 working days once dispatched.
Delivery & returns30-day returns
Try it at home for 30 days from receipt. Return it unworn and in its original packaging.
Returns policyCertificate of authenticity
Every order arrives with a Selene Origins certificate of authenticity.
Certification & qualityFree first-year resizing
On eligible rings, so a slightly-off size is never the end of the story.
Ring size guide
The One Collection: your questions
- What is The One Collection?
- The One is our 1ct collection of lab-grown diamond jewellery. Each ring, necklace and pair of stud earrings carries 1.00ct of lab-grown diamond, bezel-set in 9ct yellow gold, in five shapes: emerald, oval, pear, heart and round brilliant.
- Are the diamonds in The One Collection real?
- Yes. Lab-grown diamonds are real diamonds with the same optical, physical and chemical properties as mined diamonds. They differ only in origin — grown in a laboratory rather than dug from the earth — and they are not simulants such as cubic zirconia or moissanite.
- What colour and clarity are the diamonds?
- Every piece in The One is D/E colour and VS1-2 clarity, which sits at the colourless, eye-clean end of the scale. On the earrings, the 1.00ct is the combined weight of the pair.
- What metal is The One Collection made from?
- All pieces are crafted in 9ct yellow gold with a polished bezel setting, which wraps the stone in a smooth rim of gold for a sleek, secure and everyday-friendly finish.
- Does The One come with a certificate?
- Yes. Every order is accompanied by a Selene Origins certificate of authenticity.
- How much does The One Collection cost?
- Prices start at: rings from £499, necklaces from £499, earrings from £449. Prices include VAT.
- Which shape should I choose?
- Emerald is sleek and architectural, oval elongates the finger, pear is distinctive and graceful, heart is romantic, and round brilliant is the most sparkling and classic. If you are unsure, the round and oval are the easiest to wear every day.
- What ring sizes are available?
- The One rings are offered in J/K, L/M, N/O, P/Q, R/S. Use our ring size guide if you are unsure, and we offer free first-year resizing on eligible rings.
- How long does delivery take and can I return my piece?
- UK delivery is free, tracked and insured, typically arriving in 3–5 working days once dispatched. You have 30 days from receipt to try a piece at home and return it unworn in its original packaging.
More answers in our full FAQs, or get in touch.
Find your One.
Rings, necklaces and studs, each set with a full carat of lab-grown diamond.
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