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The Emma Diamond Firm Deluxe is a premium spring-free foam mattress designed for sleepers who need a firm, stable and temperature-regulating sleep surface. Built around Diamond Cool™ graphite-infused foam for active heat dispersal, HRX Comfort Foam for pressure relief and a dense HRX Support Foam base for lasting spinal alignment, it delivers a supportive, solid feel without the motion of springs. The PolarLuxe™ cooling cover and non-slip base complete a mattress that brings together advanced cooling technology and firm structural support in one 29cm package.
A spring-free premium foam mattress best suited to sleepers who want firm support, effective temperature regulation and a stable sleep surface that holds its shape night after night.
Firm Feel - 5/6: A supportive, solid feel designed to keep your body well supported throughout the night. Ideal for back and front sleepers, or those who prefer a firmer sleeping surface.
Best for
Not ideal for
PolarLuxe™ Cover
What it is: A premium cover crafted with advanced heat-conducting fibres that deliver an immediate cooling sensation upon contact with skin.
How it helps you sleep: Rapidly absorbs and dissipates heat to regulate temperature and maintain a consistently cool, fresh sleeping environment, preventing heat build-up for restful, uninterrupted sleep.
Diamond Cool™ Foam Layer
What it is: Emma's Visco-elastic foam engineered with graphite particles that draw away excess heat to support natural temperature regulation.
How it helps you sleep: Promotes airflow and maintains a cool, comfortable sleep environment throughout the night by actively dispersing body heat away from the surface.
HRX Comfort Foam
What it is: Emma's High Resiliency Extra foam that provides sufficient counter-pressure to keep the spine evenly aligned.
How it helps you sleep: Designed to keep the spine in proper alignment in any sleeping position, promoting maximum relief, rest and recovery throughout the night.
HRX Support Foam Base
What it is: Emma's High Resiliency Extra support foam providing counter-pressure for consistent spinal alignment across all sleeping positions.
How it helps you sleep: Supports the spine in its natural position regardless of how you sleep, helping to alleviate pressure and ensure a restorative, pain-free night's rest. This base layer also reinforces the long-term structure of the mattress for lasting performance.
Non-Slip Base
What it is: A specially designed anti-slip fabric on the underside of the mattress that anchors it firmly to the bed frame or base.
How it helps you sleep: Prevents the mattress from shifting during the night, ensuring it stays perfectly positioned so you enjoy uninterrupted, restful sleep.
| FEATURE | DETAIL |
|---|---|
| Brand | Emma |
| Category | Mattress |
| Model | Diamond Firm Deluxe |
| Firmness | Firm (5/6) |
| Mattress Type | Foam - spring free |
| Comfort Layers | Diamond Cool™ Graphite-Infused Foam, HRX Comfort Foam |
| Cover Material | 80% Polyester, 19% Polyethylene, 1% Elastane |
| Cover Removable/Washable | Yes - machine washable at 40°C |
| Mattress Finish | Quilted |
| Mattress Depth | 29cm |
| Temperature Regulation | Yes - Diamond Cool™ graphite foam and PolarLuxe™ cooling cover |
| Care Instructions | No need to flip - rotate head to toe every 3 months |
| Handles | Yes - integrated into removable cover |
| Compatible Bed Bases | Slatted (slats no more than 7cm apart) and divan bases |
| Single or Double Sided | Single sided - do not flip |
| Country of Manufacture | Germany |
| Maximum Weight Per Side | 130kg (20st) per side |
| Guarantee | 10 years |
| Mattress Trial | 200 nights |
| Ideal For | Back sleepers, front sleepers, heavier sleepers, hot sleepers |
| Certifications | NBF ApprovedOEKO-TEX® Standard 100 |
| Fire Resistance | BS7177:2008 compliant |
| Packaging Type | Rolled and Vacuum Packed |
| SIZE | WIDTH x LENGTH x DEPTH | WEIGHT |
|---|---|---|
| Single | 90cm (3ft) x 190cm (6ft3) x 29cm (11.4'') | 23kg (51lbs) |
| Double | 135cm (4ft6) x 190cm (6ft3) x 29cm (11.4'') | 28kg (62lbs) |
| King Size | 150cm (5ft) x 200cm (6ft6) x 29cm (11.4'') | 33kg (73lbs) |
| Super King Size | 180cm (6ft) x 200cm (6ft6) x 29cm (11.4'') | 40kg (88lbs) |
Vs softer models: The Diamond Firm Deluxe is built for sleepers who need structural support, not cushioning. If you sleep on your back or front, or carry more weight, this firm feel keeps your spine properly aligned in a way a softer mattress simply cannot match over time. Softer options suit side sleepers or those who prefer a body-hugging, pressure-relieving feel.
Vs medium models: Medium-feel mattresses offer a broader range of suitability but can feel insufficiently supportive for dedicated back or front sleepers, particularly heavier individuals. The Diamond Firm Deluxe gives noticeably more resistance and structural stability - you stay on the mattress rather than sinking into it.
Vs the Emma Diamond Hybrid Deluxe: Both mattresses share Diamond Cool™ graphite-infused foam and PolarLuxe™ cooling technology, making them the standout cooling options in Emma's Deluxe range. The key difference is construction - the Diamond Firm Deluxe is spring-free and firm, delivering a flat, stable surface ideal for front and back sleepers. The Diamond Hybrid Deluxe adds AeroFlex™ pocket springs for a softer, more responsive feel suited to a wider range of sleeper types. If you specifically need firm support without spring movement, the Diamond Firm Deluxe is the right choice.
The Emma Diamond Firm Deluxe is backed by Emma's 10-year manufacturer's guarantee against defects in materials and workmanship. With OEKO-TEX® certified foam layers and a precision-engineered three-layer foam construction, this is a mattress built to hold its firm, supportive shape for the long term - and the guarantee reflects that.
National Bed Federation (NBF) Approved - Independently verified to meet strict UK standards for quality, safety and responsible manufacturing. It's a meaningful endorsement that confirms this mattress has been produced to the standards that matter most to UK consumers.
OEKO-TEX® Standard 100 - Every foam layer in the Diamond Firm Deluxe carries OEKO-TEX® Standard 100 certification, confirming the materials are free from harmful substances and safe for skin contact. For a mattress you spend eight hours a night on, that matters.
The Emma Diamond Firm Deluxe does something most premium foam mattresses don't - it combines genuine firm support with advanced cooling technology. If you sleep on your back or front, run warm at night or simply need a mattress that holds its shape and supports your spine properly, this is a strong, well-engineered choice backed by Emma's 10-year guarantee.
Choosing a mattress online takes trust. That's why the Emma Diamond Firm Deluxe comes with a 200 night comfort guarantee - if it doesn't feel right, we'll exchange it. View the full mattress trial policy.
| WHAT'S INCLUDED? | |
|---|---|
| Mattress | Yes |
| Base | No |
| Headboard | No |
PLEASE NOTE:
All measurements are approximate and are subject to a tolerance of + or - 2cm.
Image is for illustration purposes only.
Pillows, cushions, throws and bed dressings not included.
Made in the UK and Ireland, Emma is the UK's most-awarded sleep brand and the world's most-sold bed-in-a-box brand! Designed to be used on a variety of different bed frames, the Emma mattress is suitable for all types of sleepers, so whether you prefer to sleep on your back, stomach, or side, you will have a comfortable and supportive sleeping surface.
At Land of Beds, we are proud to be able to offer our customers high-quality, luxurious products that are affordable and accessible to all consumers. Our independent customer reviews rate Emma's products 4.7 out of 5, giving us the confidence to provide Emma with our seal of approval and our customers' valuable insight when making informed purchasing decisions.
Combining world-class German engineering with the latest advancements in foam and spring technology, Emma uses high-quality materials and employs advanced technologies to produce its mattresses. The breathable Airgocell® foam and 3-layer zone profile adapt to every body shape to provide each body area with the necessary support, improving pressure distribution on the body. At the same time, their patented technology ensures the best spinal alignment. Emma has a good reputation for customer service and satisfaction, including offering extended sleep trials and a 10-year warranty on their products.
A great product. Supportive but comfy
read moreIs this mattress suitable for a slatted base?
Yes, this mattress is suitable for a slatted base as long as your slats are in good condition and no further apart than 7.5cm.
What is the depth of this mattress?
This mattress is 29cm deep.
Do I need to turn this mattress?
This is an easy-care mattress, which means you do not need to turn the mattress over, however, you should rotate from head to toe on a regular basis to ensure even use.
How long will this mattress last?
This mattress is guaranteed for 10 years.
Can you take away my old mattress?
Yes, we can remove your old mattress at the same time as delivering your new one. You can add this service at checkout.
Does this mattress have an odour?
As with all mattresses, there may be a slight smell when first opened. We liken this to a new car smell, which is non-harmful and will disappear within a few hours.
Can I sleep on this mattress straight away?
Yes, you can sleep on your mattress straight away.
Made to measure mattresses and divan bases are available – please call 01928 242829.
Our skilled drivers deliver throughout the UK and will deliver straight to your home. Free doorstep delivery is available on many products and you can also choose delivery to room of choice for an additional fee.
How much is delivery?
We offer free delivery to most of the mainland UK for orders over £100; there are applicable charges for deliveries to the highlands or far out UK, which can be found by putting your postcode into the delivery section on the product page. For orders under £100, there is a £10 charge.
How long does delivery take?
Once you select the required product, an approximate delivery time will be quoted on the product page before adding the item to your basket. During checkout, you will either be given the option to select your date, or we will state an estimated time for delivery. Once you have placed your order, we will contact you to book a date within the timeframe quoted.
Will I be contacted beforehand to arrange a delivery slot?
Once you have placed an order, our delivery team will contact you directly to arrange a suitable delivery slot, either via email, call, or text message.
Can I choose my delivery day?
If the product is available for next-day delivery, you can select a date at checkout. For all other products, you will be presented with an estimated timeframe for delivery. After placing your order, our delivery team will contact you via e-mail, text or call to arrange a suitable delivery day/time.
Read all our Delivery FAQs
We have an easy returns policy: If you change your mind, we're happy to accept returns within 14 days of you receiving your product, as long as they are unused and unassembled. However, for hygiene reasons, we can't take back products that have been slept on, unless there's a fault.
Custom-made products can only be returned if they are faulty.
Please take a look at our Terms & Conditions.
Can I return a mattress I've slept on?
Normally, mattresses can only be returned if they're unused within 14 days. But if your mattress has a trial period, please refer to the mattress trial information page for further details.
How long do I have to return an item I've purchased online?
You have 14 days to return an item if bought online, subject to the item not being used or assembled. Please note, if you wish to inspect a mattress, please ensure the protective outer plastic packaging is not removed, as this may affect your right to return due to health and hygiene reasons. Any product that is made to order/customised cannot be returned unless faulty.
Do I have to pay for the return?
To return your product, you can either arrange the return yourself, or we can happily arrange it on your behalf for a charge, which will be deducted from your refund. The collection charge covers the expenses involved in picking up the item from your location and safely bringing it back to our warehouse. For bedding items, the amount is £20, and for large/bulky items, charges start from £95 (depending on the product/postcode).
Can I return a part or fully assembled item?
Unfortunately, once an item is assembled, whether partially or fully, we can't accept returns unless the item is faulty.
Read all our Returns FAQs
Our skilled drivers deliver throughout the UK and will deliver straight to your home. Free doorstep delivery is available on many products and you can also choose delivery to room of choice for an additional fee.
How much is delivery?
We offer free delivery to most of the mainland UK for orders over £100; there are applicable charges for deliveries to the highlands or far out UK, which can be found by putting your postcode into the delivery section on the product page. For orders under £100, there is a £10 charge.
How long does delivery take?
Once you select the required product, an approximate delivery time will be quoted on the product page before adding the item to your basket. During checkout, you will either be given the option to select your date, or we will state an estimated time for delivery. Once you have placed your order, we will contact you to book a date within the timeframe quoted.
Will I be contacted beforehand to arrange a delivery slot?
Once you have placed an order, our delivery team will contact you directly to arrange a suitable delivery slot, either via email, call, or text message.
Can I choose my delivery day?
If the product is available for next-day delivery, you can select a date at checkout. For all other products, you will be presented with an estimated timeframe for delivery. After placing your order, our delivery team will contact you via e-mail, text or call to arrange a suitable delivery day/time.
Read all our Delivery FAQs
We have an easy returns policy: If you change your mind, we're happy to accept returns within 14 days of you receiving your product, as long as they are unused and unassembled. However, for hygiene reasons, we can't take back products that have been slept on, unless there's a fault.
Custom-made products can only be returned if they are faulty.
Please take a look at our Terms & Conditions.
Can I return a mattress I've slept on?
Normally, mattresses can only be returned if they're unused within 14 days. But if your mattress has a trial period, please refer to the mattress trial information page for further details.
How long do I have to return an item I've purchased online?
You have 14 days to return an item if bought online, subject to the item not being used or assembled. Please note, if you wish to inspect a mattress, please ensure the protective outer plastic packaging is not removed, as this may affect your right to return due to health and hygiene reasons. Any product that is made to order/customised cannot be returned unless faulty.
Do I have to pay for the return?
To return your product, you can either arrange the return yourself, or we can happily arrange it on your behalf for a charge, which will be deducted from your refund. The collection charge covers the expenses involved in picking up the item from your location and safely bringing it back to our warehouse. For bedding items, the amount is £20, and for large/bulky items, charges start from £95 (depending on the product/postcode).
Can I return a part or fully assembled item?
Unfortunately, once an item is assembled, whether partially or fully, we can't accept returns unless the item is faulty.
Read all our Returns FAQs
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