LUXURY

ETHICAL ENGAGEMENT RING SPECIALISTS

Bespoke, made-to-order engagement rings, hand-made in London, exclusively for conscious connoisseurs.

DISCOVER

as featured in...

Lydia McCarthy-Keen engagement rings recommended by best-selling author, Benjamin Daly.

Lydia McCarthy-Keen lab-grown diamonds and ethical engagement rings are featured in Luxury Lifestyle Magazine.

Lydia McCarthy-Keen ethical engagement rings and lab-grown diamonds were featured in European Life Magazine.

Lydia McCarthy-Keen lab-grown diamonds were featured in Signature Bride Magazine.

Lydia McCarthy-Keen ethical engagement rings were featured by Female First.

Lydia McCarthy-Keen ethical engagement rings and lab-grown diamonds were featured in the luxury magazine, The Sybarite.

It's fun to look for new ways to talk to consumers who love luxury and prestige, but also have deeper values.

Lydia McCarthy-Keen engagement rings recommended by best-selling author, Benjamin Daly.

Lydia McCarthy-Keen lab-grown diamonds and ethical engagement rings are featured in Luxury Lifestyle Magazine.

Lydia McCarthy-Keen ethical engagement rings and lab-grown diamonds were featured in European Life Magazine.

Lydia McCarthy-Keen lab-grown diamonds were featured in Signature Bride Magazine.

Lydia McCarthy-Keen ethical engagement rings were featured by Female First.

Lydia McCarthy-Keen ethical engagement rings and lab-grown diamonds were featured in the luxury magazine, The Sybarite.

It's fun to look for new ways to talk to consumers who love luxury and prestige, but also have deeper values.

uniting true luxury with absolute sustainability

An engagement ring is unique and special. Our clients are conscious connoisseurs, and we love to delight them.

Our ultra-luxury engagement rings are completely ethically sourced

Our mined diamonds do not solely rely on the Kimberley Process. (The process is a flawed scheme designed to eradicate blood diamonds). We vet our suppliers, and are not afraid to make changes.

We are the UK's leading experts in luxury lab-grown diamonds

Our lab-grown diamonds are completely removed from mining. Yet some diamond growers produce luxury diamonds, and some do not. We refuse over 99% of all diamonds, because they fail to meet our standard.

We exclusively use Fairtrade and recycled metals

previous commissions

unusual wedding ring sapphire top_edited

Serenade starts at £1,500

This classic, solitaire ethical engagement ring design starts at £3,000.

Diamond and Sapphire eternity/wedding band set in platinum. Design starts at £1,500.

A solitaire slim-fit gold ethical engagement ring.

A pear-shaped ethical engagement ring, with diamonds.

A beautiful, very sparkly halo engagement ring, this design starts at £3,000.

Take a fantasy stroll with 'Ice trail', which starts at £2,000.

A bar-set diamond eternity ring, in recycled platinum.

This stackable wedding or engagement ring design starts at £1,000.

A trilogy design ethical engagement ring, to represent past, present, and future.

unusual sapphire engagement ring_edited.

This is 'Coast', an unusual ethical engagement ring. This design starts at £3,000.

A 'secret diamond' ethical engagement ring in yellow gold.

A single ethical diamond set in a recycled platinum wedding ring

This vintage, 'Hepburn-style' engagement ring is perfect for lovers of old movies. This design starts at £2,000.

A simple ethical engagement ring, set in decorated metal.

This unusual diamond engagement ring design starts at £2,500.

This ultra-sparkly engagement, wedding, or eternity ring design starts at £3,000.

This simple, elegant ethical engagement ring design starts at £1,500.

ethical sapphire and diamond trilogy eng

A bezel-set ethical, lab-grown sapphire and diamond wedding ring set.

This simple design starts at £1,500.

This design can be set with ruby, sapphire or diamond, and starts at £2,000.

This beautiful and unusual engagement ring design is set with marquise diamonds, sending out shards of light. This design starts at £2,000.

This luxurious vintage-inspired design comes in any metal colour, and starts at £3,000.

A vintage-style ethical engagement ring. This design starts at £3,000.

'The Duchess' is a vintage-inspired engagement ring, with a modern twist. This design starts at £2,000.

Serenade starts at £1,500

This classic, solitaire ethical engagement ring design starts at £3,000.

Diamond and Sapphire eternity/wedding band set in platinum. Design starts at £1,500.

A solitaire slim-fit gold ethical engagement ring.

A pear-shaped ethical engagement ring, with diamonds.

A beautiful, very sparkly halo engagement ring, this design starts at £3,000.

Take a fantasy stroll with 'Ice trail', which starts at £2,000.

A bar-set diamond eternity ring, in recycled platinum.

This stackable wedding or engagement ring design starts at £1,000.

A trilogy design ethical engagement ring, to represent past, present, and future.

This is 'Coast', an unusual ethical engagement ring. This design starts at £3,000.

A 'secret diamond' ethical engagement ring in yellow gold.

A single ethical diamond set in a recycled platinum wedding ring

This vintage, 'Hepburn-style' engagement ring is perfect for lovers of old movies. This design starts at £2,000.

A simple ethical engagement ring, set in decorated metal.

This unusual diamond engagement ring design starts at £2,500.

This ultra-sparkly engagement, wedding, or eternity ring design starts at £3,000.

This simple, elegant ethical engagement ring design starts at £1,500.

A bezel-set ethical, lab-grown sapphire and diamond wedding ring set.

This simple design starts at £1,500.

This design can be set with ruby, sapphire or diamond, and starts at £2,000.

This beautiful and unusual engagement ring design is set with marquise diamonds, sending out shards of light. This design starts at £2,000.

This luxurious vintage-inspired design comes in any metal colour, and starts at £3,000.

A vintage-style ethical engagement ring. This design starts at £3,000.

'The Duchess' is a vintage-inspired engagement ring, with a modern twist. This design starts at £2,000.

REQUEST A DESIGN

how we make your ring

our philosophy

discover

The formidable beauty of an LMK diamond is the result of our intense compulsion to source only the most perfect ethical diamonds available. Discover the perfect diamond for you.

design

We create a unique, bespoke engagement ring design, perfectly tailored to you. Your design is one-of-a-kind, and we never replicate the exact-same design twice.

deliver

Your hand-crafted engagement ring is lovingly packaged in our luxury box and securely delivered, anywhere in the world, ready for the proposal to end all proposals.

BOOK AN APPOINTMENT

About Lydia

I'm Lydia, I'm an ethical diamond dealer and a luxury jeweller. I'm also the UK expert on lab-grown diamonds. My mission is to transform luxury in a truly meaningful way.

I have a background in mining. Transitioning from mining into jewellery was easy - I’m creative with a strong aesthetic. I have an incredible manufacturing team - they have all held contracts at De Beers, Cartier, Boodles, Graff, and Tiffany.

After what I've seen and heard, I didn't want to support 20th century mining practices. It makes no sense for the changes we need to make as a species.

Having said that, I want luxury, love, and abundance. I love beautiful things. Today, we have the technology and raised awareness to unite them.

We have to transform the way we buy, live, and our values. We can't do that if we only inspire a handful of people to be perfect. We need a critical mass making an impact in their own sphere of influence. My sphere is luxury diamond jewellery.

About You

My clients are connoisseurs in multiple arenas and understand how to buy fine wine, antiques, and art. They are successful individuals who recognise that they can enjoy luxury and make a positive impact.

They are patient, and prefer handmade gifts according to their individual requirements, as opposed to those available for just anyone to purchase.

0203 29 555 46

Marylebone, London