Round and trillion cut lab-grown diamond ring by THE LAB Jewellers
Tessa — Round and Trillion Cut Lab-Grown Diamond Ring (1.02ct Total) — worn close-up detail
Tessa — Round and Trillion Cut Lab-Grown Diamond Ring (1.02ct Total) — worn on the hand
Tessa — Round and Trillion Cut Lab-Grown Diamond Ring (1.02ct Total) — worn, angled detail
Round and Trillion Cut Lab-Grown Diamond Ring (1.02ct Total), view 1
Round and Trillion Cut Lab-Grown Diamond Ring (1.02ct Total), view 2
Round and Trillion Cut Lab-Grown Diamond Ring (1.02ct Total), view 3
Round and Trillion Cut Lab-Grown Diamond Ring (1.02ct Total), view 4
Round and Trillion Cut Lab-Grown Diamond Ring (1.02ct Total) — 360° spin video
Tessa lab-grown diamond ring in yellow gold, front view
Tessa lab-grown diamond ring in yellow gold, angled view
Tessa lab-grown diamond ring in rose gold, front view
Tessa lab-grown diamond ring in rose gold, angled view

Tessa — 1 Carat Round and Trillion Cut Lab-Grown Diamond Trilogy Engagement Ring (1.02ct Total)

Approx. 1.02ct total · Round and trillion

D–F colour · VS1+ clarity

Made to order — dispatched in around four weeks, hallmarked where required

Regular price£1,050.00
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Free tracked and signed-for UK delivery. View delivery details.

Metal

Made in your size at no extra cost. Ring size guide

Not sure of your size? Order a strap sizer — it is £5.00, and we email the full £5.00 straight back to you as a gift card, so it comes off the price of your ring.

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✓  Made to your size · find your ring size

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Lab-grown diamond quality

D–F colour  ·  VS1 clarity or better

Every lab-grown diamond is D–F colour and VS1 clarity or better. Round brilliant lab-grown diamonds can receive a formal cut grade; fancy shapes are assessed through their proportions, polish, symmetry and overall make. Any piece whose centre stone, on its own, weighs 1.00ct or more includes an individual IGI grading report as standard. Total carat weight does not count towards this.

A circle between two sharp points changes the whole conversation. Tessa places a round centre between matching trillion cuts, setting softness against geometry in a trilogy that feels balanced without being expected. It is a crisp choice for someone drawn to contrast more than ornament.

The 5.00mm round lab-grown diamond sits between two 4.50mm triangular trillion-cut lab-grown diamonds. Those side stones do more than accompany the centre. Their angled outlines direct the eye inward and give the trilogy a wider, more graphic shape. With just three stones and 1.02ct in total, Tessa makes every line count and leaves each distinct cut easy to appreciate.

Also in sterling silver. Tessa is available in 925 sterling silver — see the silver version.

Tessa makes contrast count

Tessa pairs two clearly different cuts in one resolved trilogy, giving you the softness of a round centre and the clean direction of trillion sides. Its three lab-grown diamonds total 1.02ct and are D to F colour and VS1 clarity or better. It is also available as a separate 925 sterling silver version. Choose 14kt for the harder, more scratch-resistant gold, or 18kt for more pure gold and a heavier feel.

  • Stone type: Lab-grown diamond
  • Stone shape: Round and trillion
  • Stones: 1 × 5.00mm round and 2 × 4.50mm trillion
  • Stone count: 3 lab-grown diamonds
  • Total lab-grown diamond weight: approximately 1.02ct
  • Metal options: 14kt or 18kt White, Yellow or Rose Gold

Ring Size

This ring is made to order in your size. Choose your UK ring size when you order — there is no extra charge for any size. If you are unsure of your size, our ring sizer makes it easy at home — and your £5 comes straight back to you as a gift card. Standard UK sizes are available — if you need guidance, contact us before placing your order.

Made to Order

Every piece is crafted to your chosen metal and size. Our usual timeline is around four weeks from order to dispatch, which includes UK hallmarking where required. More complex pieces may take slightly longer. We confirm the expected timeframe in writing before production begins.

Wearing Tessa

The matching trillion sides extend the view beyond the round centre, so Tessa reads wide across the front while remaining uncluttered. A plain gold band keeps the cut contrast clear. A fine lab-grown diamond band adds another layer without changing the trilogy. White, Yellow and Rose Gold each trace those triangular edges differently.

Questions about Tessa

How large are the three stones in Tessa?
The round centre lab-grown diamond measures 5.00mm. It is flanked by two trillion-cut lab-grown diamonds measuring 4.50mm each, giving the ring its balanced trilogy arrangement and 1.02ct total weight.

Can I order Tessa in sterling silver?
Yes. Tessa is also available as a separate version in 925 sterling silver. The gold version can be made in 14kt or 18kt White, Yellow or Rose Gold.

Will Tessa be made in my UK ring size?
Yes. Choose your UK ring size when ordering and Tessa will be made to order in around four weeks, with no extra charge for your selected size. A £5 ring sizer is available, and the £5 comes back as a gift card.

Jewellery Care

Store separately in the pouch or box provided. Avoid contact with harsh chemicals, perfume, and chlorine. Clean gently with a soft cloth or mild soap solution. Remove before swimming, exercising, or sleeping. See our Materials & Care guide for full instructions.

Need help choosing?

Unsure on size, metal, or lab-grown diamond specification? Email us and we'll guide you to the right option before you order — we reply personally, within two working days.

All pieces are made to order. Sterling silver and gold pieces dispatch in around four weeks, which includes UK hallmarking where required. Every order is tracked and signed for, and UK delivery is free. See how your piece is made, plus our Shipping & Delivery and Returns & Refunds pages for full details.

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