Our top pick out of the four collections by Diamond is the Transformation mattress. This hybrid mattress offers premium cooling features to regulate your body temperature, as well as a supportive micro-coil layer that combines with innerspring and memory foam layers to provide total pressure relief.

Diamond Mattress has been around since 1947 and is a family-owned company, specialising in high-quality mattresses with a focus on wellness. The bed-in-a-box company has four mattress collections that use a combination of pocketed coils and memory foam layers to offer a variety of beds to suit different budgets – all with the aim of providing an undisturbed night’s sleep.

#1 Best Affordable Diamond Mattress: Grateful Mattress

 Diamond Grateful Mattress

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The Grateful mattress is the most affordable option from Diamond, but that doesn’t mean it only has basic features.

This hybrid mattress offers reinforced centre support for your back, contouring memory foam layers for comfort, and cooling features to keep you cool as you sleep.

What We Like:

  • Hypoallergenic
  • Cooling features
  • Zoned support system
  • Good edge support

What We Don’t Like:

  • Lacks durability
  • Lack of reviews online

The Grateful mattress is 10-inches in height and is constructed from an innerspring coil unit, topped with layers of foam.

The base layer is a patented zoned support system, which adds 25 percent more support to the centre of the mattress, giving your back additional support where you need it. This layer is then topped with 2-inches of HD comfort foam and a 1-inch layer of CoolTek gel memory foam.

This gel memory foam layer is designed to contour around your body in any sleep position to provide pressure relief and enhanced blood circulation for improved recovery. It also works in tandem with the zoned support system to reduce motion transfer between partners.

The cover of the mattress consists of luxury airflow quilting for additional cooling. It is made of a stretch-knit fabric, designed to wick moisture away from the body for a more comfortable sleep surface.

All Diamond mattresses include a foam-encased comfort edge, giving the mattress a consistent, supportive feel from edge-to-edge.


A good feature Diamond offers with their mattresses is the ability to select from three different firmness options: Plush, Medium, and Firm.

The Plush feel is rated as a 4 out of 10 on a scale of 1-10, with 10 being the firmest. The Plush model will, therefore, feel very soft and is best suited to side sleepers and people who like a plush feel that they can sink into.

The Medium feel is Diamond’s best seller and should provide a comfortable feel for the majority of sleepers. This is ideal especially for couples who have different sleep preferences. This feel is rated as a 6 out of 10.

Finally, the Firm mattress is rated as a 9 out of 10, giving it an extremely hard, firm feel, best suited to back sleepers or anyone who enjoys a very firm mattress. If you do not like the feel of a firm mattress, you will find this option far too hard.

Motion Transfer & Cooling

This mattress has features that suggest it is adept at isolating motion transfer for minimal disruption, as well as providing a cool sleep surface that regulates your body temperature to keep you comfortable.

The wrapped coils and gel memory foam layer work together to reduce motion transfer when you move around on the mattress, while the foam-encased edge system should also prevent disturbance when you or your partner get in and out of bed.

In addition, the gel-infused memory foam is designed to allow air to pass through the mattress easier, which should provide a cool sleep surface when combined with the breathable, moisture-wicking, stretch-knit cover.

The downside is that there are a lack of sufficient reviews online to draw any concrete conclusions as to how effective these features actually are: while many reviews are generally positive, they do not specifically state if the mattress sleeps cool or drastically reduces motion transfer.

Overall, however, this mattress is constructed from quality materials and seems to offer a number of benefits for a comfortable, supportive, and cool night’s sleep, at an excellent price.

#2 Best Diamond Mattress For Hot Sleepers On A Budget: Intention Mattress

Diamond Intention Mattress

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The Intention mattress is most notable for its additional layer of Diamond Sparkle foam, a temperature regulating foam that draws heat and moisture away from the body for a cooler night’s sleep.

People who tend to sleep hot but don’t want to fork out for a premium model may find the Intention mattress perfect for their needs.

What We Like:

  • Patented zoned support system
  • Temperature regulating technology
  • Good edge support
  • Lifetime warranty

What We Don’t Like:

  • Some user reviews suggest mattress begins to sag too quickly

The Intention mattress is described as creating a ‘soothing sleeping environment’ by blending temperature regulation technology that can help to keep you comfortably cool throughout the night.

The 10-inch high mattress is constructed from the same zoned support system as the Grateful mattress, which is then topped with a 2-inch layer of HD comfort foam and another 1.5 inches of hyper-conductive Diamond Sparkle foam, which is said to be capable of recalibrating your core temperature to keep you comfortable throughout the night.

The Intention mattress then has 1.5 inches of luxury Airflow quilting, topped with a CoolTouch cover made from a conductive fabric that moves heat away from your body for a cooler sleep surface.


Again, this mattress is available in three feels: Plush, Medium, and Firm. However, the Plush model is rated as a 3/10 on a 10 point firmness scale and the Medium, a 5/10, so it is likely to feel slightly softer than the Grateful mattress.

Motion Transfer and Cooling

The Intention mattress has the same zoned support system as the Grateful mattress, in which each wrapped spring isolates motion between partners while sleeping. This, in combination with the foam encased edge system, should prevent motion from transferring when you or your partner move around.

This mattress from Diamond includes additional cooling features that explain why it is more expensive than the Grateful mattress. The Intention includes a layer of Diamond Sparkle foam, which is designed to actively regulate your core temperature and dissipate heat from your skin.

Additionally, this mattress has a CoolTouch temperature regulating fabric cover, which moves heat from the skin, wicks moisture away from the body, and allows air to pass through the mattress for a cool, comfortable sleep surface, all night.

The Intention mattress also receives generally good reviews, although some customers mention that the mattress loses support and starts sagging sooner than they would expect. You do get a lifetime warranty with your purchase to protect you from material defects should this happen, however. This would be our top pick for hot sleepers who still want a budget-friendly mattress.

#3 Best Diamond Mattress For Responsive Comfort: Faith Mattress

Diamond Faith Mattress

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Diamond describes their Faith mattress as offering ‘responsive comfort’ that adapts to your body’s needs. With temperature regulating materials, such as a Diamond Sparkle foam layer and CoolTouch Advanced cover, this more expensive model promises a cool night’s sleep that monitors your comfort throughout the night.

What We Like:

  • Includes temperature regulation features
  • Contouring support from memory foam layers
  • Zoned support system
  • Good edge support

What We Don’t Like:

  • Very similar to the Intention model, but much more expensive
  • Loses support

The Faith mattress is also 10-inches in height and shares the same basic construction as the other Diamond mattresses: a zoned support system topped with 2-inches of HD comfort foam.

The mattress then has another 2-inch layer of hyper-conductive Diamond Sparkle foam for temperature regulation and pressure relief and a CoolTouch Advanced cover.

The CoolTouch Advanced cover is described by Diamond as ‘the most receptive temperature-regulating fabric in the market’, responding to your body temperature to absorb heat and recalibrate your inner core temperature.


As with the other Diamond mattresses, the Faith comes in three different firmness options. The Plush mattress is rated as a 2 out of 10 on a 10 point mattress firmness scale, giving it a very flexible feel that conforms to your body. People who prefer a firmer surface or who weigh more may find they sink too much with this option.

The Medium mattress is rated as a 4 out of 10, so it leans towards a plusher feel, while the Firm mattress is rated as an 8 out of 10.

Motion Transfer & Cooling

The Faith mattress has the same motion control features as the Intention mattress: a zoned support innerspring system and two memory foam layers, which provide deep pressure relief while also isolating motion between partners. Additionally, the Faith mattress also has the foam-encased comfort edge to reduce motion transfer and provide consistent support from edge to edge.

Where the Faith mattress differs in terms of cooling technology is in its cover. The mattress features Diamond’s CoolTouch Advanced regulating fabric to ensure your body remains a comfortable temperature throughout the night. The fabric is able to actively move heat away from your skin to allow it to dissipate throughout the mattress and keep your body cool.

The Faith mattress is the most affordable Diamond mattress to feature Phase Changing Material for advanced temperature regulation. If you tend to sleep hot and are looking for a mattress that works to keep your body comfortable and cool throughout the night, you might like this option.

#4 Best Diamond Mattress Overall: Transformation Mattress

Diamond Transformation Mattress

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The Transformation mattress is Diamond’s most premium option, featuring advanced temperature regulating fabric and a micro-coil support system, for deep pressure relief and comfort as you sleep.

This mattress is designed to regulate your temperature throughout the night and provide a supportive surface that helps to keep your neck, shoulders, and spine aligned throughout the night for undisturbed sleep.

What We Like:

  • Offers targeted pressure relief
  • Good motion absorption
  • Temperature regulation features

What We Don’t Like:

  • More expensive for not many new features
  • Some reviews suggest the memory foam starts to sag

The Transformation mattress is 10-inches in height and has the same base as the other three collections from Diamond: a zoned support system with 25 percent more coils in the centre of the mattress and a 2-inch layer of HD comfort foam.

Unique to this mattress is the micro-coil comfort layer that tops the base layers, consisting of over 1,000 micro-coils that provide ‘weightless pressure relief’, increase airflow, and reduce motion transfer across the mattress.

The Transformation mattress then has another layer of Diamond Sparkle memory foam topped with CoolTouch Advanced fabric.


The Transformation mattress is available in Plush, Medium, and Firm. The Plush mattress is rated as a 3/10, while the Medium mattress is rated as a 5/10, and the Firm is rated as an 8/10.

If you’re not sure what type of mattress feel you most prefer, the Medium mattress provides an excellent middle ground that should suit all sleep styles and couples with different sleep preferences.

Motion Control & Cooling

This is the best mattress out of the four Diamond collections in terms of motion control, as the additional layer of micro-coils helps to completely isolate motion, even if your partner moves around beside you.

What’s more, the micro-coil system is designed to provide deep pressure relief, contouring around the shape of your body to encourage you to remain still and rested throughout the night.

Equally, the Transformation mattress may perform best in terms of cooling: it features the same Sparkle foam, which draws excess heat and moisture away from the body, as well as Diamond’s specialist CoolTouch Advanced Phase Change Material, which regulates your body temperature as you sleep for total comfort.

In addition, the micro-coil layer further serves to enhance airflow through the mattress, allowing the other cooling features to dissipate heat through the mattress easier, for a cool sleep surface.

Overall, the Transformation mattress is Diamond’s most premium mattress, with a higher price tag to match, but the features are impressive. If you are looking for a mattress with a number of cooling features that also offers deep pressure relief and support, this option ticks all the boxes.

Additional Information

Sleep Trial & Warranty

Diamond provides a 120-night sleep trial period with their mattresses, which means they’ll pick up the mattress and fully refund your money within those 120 days if you decide the mattress isn’t right for you.

They also offer an impressive lifetime warranty, which covers indentations greater than 1.5 inches not related to the use of an improper foundation, physical flaws, and manufacturing defects. Since the biggest criticism of the Diamond mattresses seems to be that they can sag relatively quickly, this warranty is a huge bonus.


Diamond mattresses are described as suitable for most standard foundations and bed frames, so you shouldn’t need to replace your foundation when you buy your mattress. They are also compatible for use with adjustable bed bases.


Diamond mattresses are significantly less expensive than some competitor models. They explain that by removing the middleman and selling directly to customers, they are able to offer the best prices possible.

This is a similar model for most bed-in-a-box brands who save their customers money by delivering directly to your door, rather than going through a third party.


The foams used by Diamond are CertiPUR-US certified, which means they are free from:

  • Ozone depleters
  • Mercury, lead, or other heavy metals
  • Formaldehyde
  • Phthalates

For this reason, the mattress shouldn’t have any strong chemical smell when you first unpack it and, if it does have an odour, it is from the new foam, not from chemicals.

Final Verdict

Overall, the four mattresses Diamond offers are well-made with quality materials, promising a supportive surface with excellent cooling features.

The biggest criticism these mattresses face are the reviews that suggest the mattresses lose shape and sag relatively quickly – but, with a lifetime warranty attached to every purchase, this seems like a minor criticism that could be fixed quickly.

With the lifetime warranty and all-around affordable prices, this hybrid mattress company is a good option for a quality mattress that won’t break the bank.

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