Emma Diamond Hybrid Mattress

Emma Diamond Hybrid Mattress Review

The Emma Diamond Hybrid Mattress forms the flagship model in Emma’s mattress range. This collection also includes the Emma Original Mattress and the Emma Comfort.

The Emma Diamond Hybrid Mattress classifies as a true ‘hybrid’ mattress, meaning that it contains a combination of foam layers and springs in one cohesive unit (without a distinguishable pillow top).

Purchase and delivery

As with other bed in a box products, the Emma Diamond Hybrid Mattress can be conveniently ordered online through the Emma website. Delivery is free and your mattress will arrive at your door in a box (see delivery times in the ‘Delivery’ section further down). Our box arrived in excellent condition, thanks to some additional plastic wrapping around the box.

The Emma Diamond Hybrid Mattress was easy to remove from its packaging, however we still recommend having two people available to unpack a mattress in a box.

The mattress comes with a neat product booklet (in 6 languages) as well as a handy cutting tool. Unpacking the Emma Diamond Hybrid Mattress should only take 5-10 minutes, and we allowed it to decompress for 24 hours before testing.

You can see this mattress in more detail in Emma’s information video here:

Aesthetically, the Emma Diamond Hybrid Mattress has a modern, futuristic look. It uses a white, grey, and green, colour theme with stylish lines and indentations. Its brand name embroidery also gives it a nice touch of class.

Comfort and support

The Emma Diamond Hybrid Mattress has a special ‘climate-regulating’ and elastic cover. This cover is removable and washable, making it easy to keep your bed clean. The zip mechanism is strong, making the cover easy to remove.

This cover sits over a layer of ‘Diamond Degree® graphite foam’ and a layer of adaptive foam. These layers feel foamy and dense, with a slight ‘hardness’ to them. Nevertheless, this comfort layer offers reasonable pressure relief, and body weight is absorbed evenly.

This mattress should suit all sleeping positions (side sleepers, back sleepers, and stomach sleepers) but understandably, its suitability will vary between individuals.

Based on our testing, our team rated it as a ‘medium-firm feel’ and an 7.5 / 10 on the firmness scale (with 10 being the firmest). Please note that our firmness ratings are just a guide and they do not necessarily relate to comfort. Furthermore, our firmness ratings are assigned based on Bedbuyer’s testing process and these may differ from firmness ratings given by individual companies.

The main support structure of this mattress is a pocket spring system that uses individually encased steel springs. This spring unit offers good back support and should accommodate people of all sizes. It feels quite stable and partner disturbance is not significant.

It uses a special graphite infused foam that can help with temperature regulation.

The Emma Diamond Hybrid Mattress also contains a layer of ‘HRX foam’ at the base of the mattress. This is aimed at providing additional support and durability.

The Emma Diamond Hybrid Mattress responds nicely to normal sleep movements and we rated its level of responsiveness in the ‘optimal’ zone. In basic terms, this means that changing sleep positions (and intimate activities) shouldn’t be any trouble.

The finer details

Like the Emma Original Mattress, the Emma Diamond Hybrid Mattress is noticeably light (32kgs, queen size). This makes the mattress easier to unpack, transport, and to change the bed sheets (which can be difficult with heavier mattresses).

As a comparison, other hybrid mattresses like the Onebed X Mattress (44 kgs) and the Zeek Hybrid Mattress (42kgs) are significantly heavier.

The Emma Diamond Hybrid Mattress has a solid 150 night trial period and a 10 year warranty. It is also worth mentioning that all foam layers in this mattress are certified as non-toxic by OEKO-TEX®, one of the worlds leading authorities in foam testing.

What bed base should I use?

As with most mattresses, we recommend the Emma Diamond Hybrid Mattress to be used with a solid bed frame (such as the Sleep Republic Pro Base), or a solid ensemble base (with the slats no longer than 8 cm apart).

A bed frame (with flexible slats) may still be adequate, but again, we strongly recommend that the distance between each slat is less than 8 cm. Use of an unsupportive mattress foundation will usually void the mattress warranty.

Sleep Republic Pro Base

Furthermore, we do not recommend the Emma Diamond Hybrid Mattress to be used with an adjustable (electric) bed base as this may also void the warranty. Here is our full list of mattresses that are compatible with an adjustable bed base.

It’s worth noting here that mattress firmness, performance, and durability will vary with different bed bases.

Available sizes

This mattress is available in 5 sizes (king, queen, double, king single, and single size) so it should accommodate most sleeping situations.

Here are Australia’s standard bed (mattress) sizes in 2025.

Final verdict

The Emma Diamond Hybrid Mattress is a respectable mattress that offers good value. It provides good back support, and its graphite infused foam layer may help those who struggle with heat during sleep.

Bedbuyer’s rating:  3.7 / 5

Here are our ratings for each category:

Did you know? Bedbuyer recently announced Australia’s Top 12 Mattress in a Box in 2025.

If you have any questions about this mattress, comment below or please contact us.

In a nutshell 🥜

• Medium-firm feel
• Graphite foam to reduce heat
• Good value
• 100 night free trial

Recommended Retail Prices

• King Mattress: $1,869
• Queen Mattress: $1,719

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Trial Period

100 nights

Warranty

10 years

Delivery

Free delivery

Delivery takes 1-3 business days for metro areas. Estimated time of delivery for outside metro areas usually take 5-10 business days but may depend on your shipping area.

Delivery estimates are subject to the availability of stock.

Certifications – Emma Diamond Hybrid Mattress

Class 1 – OEKO-TEX® Certified

Specifications – Emma Diamond Hybrid Mattress

Take your sleep to the next level with the Emma Diamond Hybrid.

This mattress has all the needed features to give you the sleep you deserve. Our multi-layer HRX support foam will provide 3 zone back support for optimal cushioning and support. Our individual encased spring layers offer motion isolation while also giving superior durability. Finally, our Diamond Degree® Graphite foam is optimised to take away excess heat, making sure your temperature is ideal for a full night’s sleep.

• Weight of mattress: 32 kgs (Queen Mattress)
• Mattress Height: 25 cm
• Country of Origin : Germany

Climate-regulating and elastic cover

This fully breathable, removable, and washable premium cover is designed to help facilitate heat dissipation of the Diamond Degree graphite foam. Its airy structure lets the mattress breathe during the day without hindering the thermoregulatory effects of the mattress.

The top of the cover is made of 99% polyester and 1% elastane, the bottom is made of 100% polyester, and the base is made of 87% polyester and 13% polypropylene.

Diamond Degree® graphite foam

With the infusion of diamond and graphite particles, this innovative coating quickly dissipates excess heat away; extending the duration of your deep sleep phase. The low rolling-resistance of the foam also requires less effort from your body when you involuntarily toss and turn during sleep, meaning you’re less likely to wake yourself up or be disturbed by your partner in the middle of the night.

Adaptive comfort foam

This ergonomically designed foam layer adapts to your body and optimally distributes body pressure, allowing you to sleep comfortably regardless of your build or sleeping position (back, side, stomach).

Pocket springs

The individually encased steel pocket springs provide dynamic body adaptation and improved breathability over a standard foam mattress, while also allowing for movement isolation to minimise disturbances brought about by movements.

HRX foam

This supportive foam layer provides optimal 3 zone back support and superb durability.

An innovative mattress for better sleep

The latest innovation from Emma’s Research and Development team. The deep sleep phase is one of the most important areas in our sleep research. Facilitating faster, cooler, longer, and deeper sleep is the promise of Emma’s Diamond Hybrid.

Perfect body support

A hybrid mattress without compromise: the Diamond Hybrid mattress completely moulds to your body, thanks to its adaptive comfort foam and pocket spring construction.

Optimised deep sleep

The excellent cooling and heat dissipation properties of the Diamond Hybrid mattress helps your body maintain the ideal sleeping temperature, enabling you to sleep longer in the deep sleep phase and feel more well rested when waking up.

Revolutionary technology

The innovative Diamond Degree® foam infused with diamond and graphite particles quickly dissipates excess heat, thus achieving the ideal sleeping temperature in record time and helping you fall sleep faster.