Free delivery across the UK Up to 10 years warranty Secure card payment Every UK size, Single to Super King
07572 367757
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Free delivery to every UK postcode

Diamond Mattress UK Pocket-sprung comfort, made to last.

Four mattress collections in every UK size, from £99. Delivered free to your door, with up to 10 years' warranty.

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Diamond Mattress UK pocket spring mattress on a bed in a warm, lamp-lit bedroom
Free UK deliveryOn every mattress, no minimum
Up to 10 years warrantyLength depends on the collection
Secure card paymentVisa, Mastercard and Amex
WhatsApp supportReal answers on 07572 367757

Four mattresses, one for every sleeper

Each Diamond Mattress UK collection is a different build. Pick by depth, by feel, or by how much support you want under you.

Best Value
Diamond Essential mattress, 25cm tight top - Diamond Mattress UK
25cm deep, tight top

Diamond Essential

Honest, breathable comfort for everyday rest

1 Year Warranty
From £99
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Most Popular
Diamond Sleep Comfort mattress, 30cm euro top - Diamond Mattress UK
30cm deep, euro top

Diamond Sleep Comfort

A softer top layer for deeper, uninterrupted sleep

2.5 Years Warranty
From £239
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Tallest Build
Diamond Hybrid Royal mattress, 35cm euro top - Diamond Mattress UK
35cm deep, euro top

Diamond Hybrid Royal

Our tallest build, engineered for full-body support

5 Years Warranty
From £299
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Flagship
Diamond Premium Luxe mattress, 30cm euro top - Diamond Mattress UK
30cm deep, euro top

Diamond Premium Luxe

Memory foam comfort with targeted zonal support

10 Years Warranty
From £399
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Compare all four side by side

UK mattress sizes

Every collection comes in all five standard UK sizes, so it fits the bed frame you already own.

Single

90 x 190 cm
3ft x 6ft3

From £99

Small Double

120 x 190 cm
4ft x 6ft3

From £119

Double

135 x 190 cm
4ft6 x 6ft3

From £129

King

150 x 200 cm
5ft x 6ft6

From £149

Super King

180 x 200 cm
6ft x 6ft6

From £199

What's inside a Diamond mattress

Four working layers, shown here for the Diamond Premium Luxe. No filler, nothing hidden.

Cutaway of a Diamond Mattress UK mattress showing the quilted top, foam filling, pocket springs and base

  1. Top: quilted knitted fabric + polyester fibre + foam

    The first thing you feel: soft, breathable and quilted.

    Top layer material

  2. Filling: memory foam + foam

    Cushions shoulders and hips so pressure spreads out instead of building up.

    Filling layer material

  3. Support: three-zone pocket spring with foam box

    Individually wrapped springs follow your spine and stop movement travelling across the bed.

    Support layer material

  4. Base: 1cm foam + polyester fabric

    A hard-wearing foundation that keeps everything above it stable for years.

    Base layer material

See the difference a new mattress makes

Drag the handle to compare a tired bed with one made up on a Diamond mattress.

A neatly made bed on a Diamond Mattress UK mattress
A rumpled, unmade bed on an old mattress
Before After

Watch the Diamond Mattress story

A closer look at the mattresses behind the name.

What customers say about Diamond Mattress UK

Bought a Diamond mattress? Tell other shoppers how you're sleeping on it. Every review here comes from a real customer.

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Why choose Diamond Mattress UK

4
mattress collections
10
years' warranty on our flagship
5
UK sizes, Single to Super King
£0
delivery, anywhere in the UK

Questions people ask before they buy

Can't see yours? Ask us on WhatsApp or send a message.

Most orders are delivered within 3-7 working days across the UK, and delivery is free on every mattress with no minimum order value.

Warranty length depends on the collection, from 1 year on Diamond Essential up to 10 years on Diamond Premium Luxe. It covers manufacturing faults such as sagging beyond the accepted limit, broken springs or defective foam. It does not cover normal wear and tear or stains.

Yes. Every mattress comes with a trial period so you can sleep on it at home. If it isn't right for you, get in touch and our team will talk you through your options.

It depends on the feel you like and your budget. The comparison table on the Mattresses page shows depth, construction and firmness side by side, or message us on WhatsApp and we'll help you choose.

All five standard UK sizes: Single (90 x 190 cm), Small Double (120 x 190 cm), Double (135 x 190 cm), King (150 x 200 cm) and Super King (180 x 200 cm).

Rotate it every few months, use a breathable mattress protector and avoid bending or folding it. Spot-clean marks with a mild detergent and let it air dry fully before making the bed.

If your mattress is faulty or not as described, you're entitled to a refund or replacement. The Refunds and returns page explains eligibility and how to start a claim.

From the Sleep Journal

Plain-English guides to choosing and looking after a mattress.

All articles
How to Choose the Right Mattress Thickness for Your Back
Mattress Guide

How to Choose the Right Mattress Thickness for Your Back

Find the perfect mattress thickness to support your spine and wake up pain-free every day.

5 min read Read article
Pocket Spring vs Memory Foam: What's the Real Difference?
Sleep Education

Pocket Spring vs Memory Foam: What's the Real Difference?

We break down the pros, cons, and best uses of both so you can choose smarter.

4 min read Read article
How Often Should You Replace Your Mattress?
Mattress Care

How Often Should You Replace Your Mattress?

Not sure if it's time for a new mattress? Here are the signs you shouldn't ignore.

6 min read Read article