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Emma Diamond Degree Topper Review

TSA reviewer Connie Hack

Written By Connie Hack

Sleep Advisor

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How We Test

Our testing process

Couple feeling Emma Diamond Degree Topper

22 November 2023 7 min read

In this Emma Diamond Degree topper review, we're going to find out how much of a difference a good mattress topper can make to your sleeping experience!

Who is the Emma Diamond Degree topper for?

The biggest selling point for the Emma topper is its sleep tech qualities that cool down your body and offer better deep sleep. The Emma topper is also on the thicker side of things (at 9cm ) and highly comfortable to boot. So, it's perfect for:

  • Hot sleepers
  • Side and back sleepers
  • Sleepers with joint or back pain.

What do we use this product for?

The most obvious use for this mattress topper is to combat the stuffiness that comes with an old mattress. The temperature regulation qualities on their own already make the Emma topper a good addition to any sleeping routine.

However, the topper is also thick and comfortable, meaning that it can add some softness to a stiff mattress and even provide pressure relief throughout the night. We can use it for:

  • Temperature regulation
  • Superior comfort level
  • Pressure relief


An icon depicting air passing through a fabric
Highly breathable
The Diamond Degree foam & HRX foam ensure high level of breathability.
High quality craftmanship
The high-quality product that will last long time.
An icon depicting a medal indicating a warranty
10 year warranty
You get 10-year warranty + 100-nights trial.


An icon representing a non-removable cover
Non-removable cover
Though high-quality, the cover is not removable.
An icon depicting a money bag indicating an expensive product
A bit pricey
It is a bit expensive when compared to similar products from the same category.

Features you should know about the Emma Diamond Degree mattress topper

We've already made a few claims about this mattress topper. Now it's time to dissect what makes it so great and see how all the features meld together in order to create a premium product.

Diamond Degree Technology

Let's start things off with arguably the most impressive aspect of this mattress topper – the top layer of the topper, the graphite layer. Graphite is an excellent thermal regulator, allowing your body heat to quickly and easily disperse into the lower layer of the topper as you sleep.

This graphite foam layer is what gives the Emma Diamond topper such a competitive edge. Plus, graphite is hypoallergenic, meaning that you don't have to worry about the graphite particles causing any type of rash or allergic reaction.

An image of emma diamond degree topper structure illustration.

And if you combine this topper with a good hybrid mattress you can rest assured that things will stay cool and comfortable. And don't worry, if you want to know what hybrid mattress is the very best, just check out our guide.

Adaptable HRX comfort foam

Although not as flashy as the graphite foam layer, the comfort foam layer is still essential for this topper. The HRX foam allows for your body heat to pass through the topper smoothly and it provides pain and stress relief while you sleep.

Because if you want a deeper sleep, not being in pain is a really good place to start.
Plus, the adaptive comfort foam can resolve a lot of discomfort if you have an old mattress that has lost its bounce long ago. So, even the HRX foam is essential in order to raise your sleep quality.

Breathable and elastic cover

As we've seen with the first two layers, a key feature of this topper is its capability to disperse body heat. So, even the covers are made to be extremely breathable.

And if that wasn't good enough, it's also a removable cover, meaning that getting things clean and fresh is as easy as it gets.

100-night trial and 10-year guarantee

When buying a mattress or a mattress topper, trials and guarantees are always a sight for sore eyes. After all, most mattresses can be deceptive at a single glance. However, with such a generous trial period and a decade-long guarantee, getting Emma toppers doesn't feel like a risk, which most sleepers will be thankful for.

OEKO-TEX Standard 100 certified

This certification means that every part of the mattress topper has been tested for harmful substances. And as the “100” would suggest, Emma passed with flying colours. That means that this product is completely safe for adults and children alike.

Plus, it means that the production of the Emma topper was done under sustainable socially responsible conditions – which is always a nice plus to have.

Review of the Emma Diamond Degree topper

An image of emma diamond degree topper close up..

Overall, this mattress topper has been delightful. It's a bit expensive, but we think that it more than makes up for the price with its premium level materials and effective design. In terms of temperature regulation, it has had an excellent performance, keeping things nice and cool even when the bed was placed in a stuffy room.

The memory foam offered sufficient support and stress relief. And in our experience, our deep sleep has in fact been positively affected. There were no body aches upon waking up and no discomfort during the night.

Aspects like motion transfer and edge support were a bit more difficult to gauge, as those primarily rely on the mattress rather than the topper. However, when placed on an Emma Hybrid, things ran smoothly and the edge support was more than sufficient. Needless to say, Emma seems to be offering some premium-level products.


What we like about the Emma Diamond Degree topper

What we didn’t like about the Emma Diamond Degree topper

The common problems with the Emma Diamond Degree topper & how to solve them

The most common problem people might have with the Emma topper is the lack of support. And the best way to solve this problem is to make sure you also have a good mattress underneath. Personally, I'd go for the Diamond hybrid mattress, as hybrid mattresses will keep things nice and cool while also adding some firmness through the box springs. Plus, if you're going for the Emma hybrid, there's already a precedent for the level of quality you can expect.

Check the alternatives to the Emma Diamond Degree topper

If the Diamond Degree doesn't seem to be to your liking, there are always more options out there. In fact, if you want a good premium topper from a well-established company, why not go with Simba? You can read our full review here, but here are the cliff notes.

Simba Hybrid Foam & Spring Mattress Topper

a product image of simba hybrid mattress topper

If you want the same premium quality that the Emma Diamond is offering but you're looking for a bit more support and stability, Simba Hybrid mattress topper could be for you.

The 2500 pocket springs will give you the optimal balance between comfort, firmness & pain relief. Plus, the topper is hypoallergenic so you can sleep without any stress that you might caught allergy or anything.

With wriggle-free sleep straps to stop the topper from moving around during the night and the renowned triple Simba layer structure, the Simba topper is bound to leave an impression.

Check our full review on Simba Hybrid topper.


An icon depicting lightweight properties
The superb comfort
2500 pocket springs ensure the superb comfort & optimal firmness.
An icon depicting a leaf indicating hypoallergenic properties
Forget allergies, dust mites & bacteria.
an icon depicting straps included
Secure it with straps and prevent the slipping issue.


An icon representing a non-removable cover
Non-removable cover
The cover, though hypoallergenic, is not removable. Makes maintenance difficult.
An icon depicting the product is not side sleeper friendly
Too firm for side sleepers
Some side sleepers might find it too firm for them.

What makes this product better than some other similar ones?

What makes the Emma topper a game changer is its intricate layer design. It's built in a way where your body stays cool through the night and allows sleep to come easily. Both the foam and the graphite layers are also very soft, leading to a heightened comfort level as well.

How did we test the product?

Now we're going to explain a bit more about how we actually test our products. On the most fundamental level, all products go through the following inspections:

An image of emma diamond degree topper on a bed in bedroom.

With the Emma topper, we wanted to test how well it worked with a variety of different mattresses over the course of multiple days. Between spring, foam, and hybrid mattresses, old mattresses, and brand new ones, here are the tests we did:

Is the Emma Diamond Degree mattress topper eco-friendly or sustainable?

Although the Emma topper does sport an OEKO-TEX Standard 100 certification, it doesn't seem to be doing much else in terms of green initiatives:

Aside from this, we were able to find next to nothing about Emma's green initiative. So, they could definitely do a lot better in this field.

Overall impressions of the product after the testing

Overall, the Emma topper was an amazing product as far as we're concerned. When paired with something like the Diamond Hybrid mattress, we experienced a great deal of comfort and had no issues with overheating. And even when we didn't put it on the best mattress at hand, the results were satisfactory. Our only issue came about when placing it on a very firm or old mattress, as even the Emma topper can't salvage that situation.

The King size was big enough for all of our mattresses and the foam didn't have any major off-gassing issues. Finally, the cost, although on the more expensive side of things, didn't seem too egregious. Overall, testing went well and the Emma topper gets a golden star from us.

FAQs about your Emma Diamond Degree topper

Is the cover of Emma Diamond Degree topper washable?

Yes, you can simply remove it and wash it at a maximum of 40 degrees.

Can the graphite cause an allergic reaction?

The product is hypoallergenic and tested against harmful substances, so no allergic reaction should occur.

What is the return policy?

You get a 100-night trial period throughout which you can return the Emma topper and get a full refund.

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