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Specialty Firm Collection Reviews

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Specialty Firm Collection

The Specialty Firm Collection, with two modelsóThe Rock and The Stoneówas designed by Diamond Mattress for maximum support. Diamond says, "Our customers asked for firm, and we listened. The Rock and The Stone are . . . our firmest tight-top and pillow-top mattresses." These are extra firm mattresses, rating 9 and 10 on a firmness scale of 1-10.

Of the two Specialty Firm models, tight-top The Rock is the firmer at 10, and pillowtop The Stone at 9 is only slightly softer. Both models rely on a VertiCoil innerspring for support. VertiCoil is an open offset alternating coil innerspring system designed and made by Leggett & Platt. Those used in the Specialty Firm Collection are tri-zoned for lumbar support. Offset coils are hourglass-shaped, like Bonnell coils, but have flattened ends connected to adjoining coils by a hinge-like helical wire, making this more flexible than a Bonnell innerspring. VertiCoil has 21% more coils than the traditional Bonnell coil innerspring.

Edge support is provided by foam encasement.

The comfort layers of the Specialty Firm models consists of Eco-Flex, foams made from plant-derived oils. This means less outgassing and less use of petroleum-based polyols. The role of the Eco-Flex is to cushion the firmness without compromising it so the user gets support and comfort.

Mattresses in the Specialty Firm Collection are not compatible with adjustable bases. They are not flexible enough. But Diamond Mattress makes a hardwood foundation which provides the needed support in 8" and 4" heights. They also sell a heavy-duty metal frame for getting the foundation off the floor.

Diamond Mattress warranties the Specialty Firm Collection mattresses, The Rock and The Stone, for 20 years. But they say, "Although our mattresses have been tested and will last 20 years, we recommend changing every 8 to 10 years. As your body changes, your mattress needs will change over time."

  • Mattress and Bed Set Model Name

    Diamond Mattress Specialty Firm Collection

  • Price Category


  • Listed Manufacturer

    Diamond Mattress

  • Location

    Diamond Mattress, Attn: Customer Service, 3112 E. Las Hermanas St., Rancho Dominguez, CA 90221

  • Bed Classification


  • Level of Firmness

    Ultra Firm

  • Inner Bed Composition

    Offset alternating coil innerspring and foam comfort layer

  • Mattress Edge Support

    Foam encasement

  • Mattress Cover Composition

    Durable rayon knit

  • Total Mattress Height

    13 inches

  • Bed Foundation

    Hardwood foundation

  • Special Features

    Extra firm support, Plant-based foam cushioning

  • Sleep Trial

    not stated

  • Bed Warranty

    20 year limited warranty

  • Manufactured In


  • Restrictions

    adequate foundation required

  • Website


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