Glory Firm pairs a swirl-pattern gel memory foam top with a high-density foam base for a firm-leaning memory foam feel that sleeps a notch cooler than traditional foam. Best for back and stomach sleepers who like the slow contour of memory foam without the deep sink.
Gel and foam blended together — better airflow than infused gel beads, more uniform feel.
High-density base foam keeps you on top of the mattress, not sunk in.
Open-cell gel structure stays a measurable few degrees cooler than standard memory foam.
Diamond's flagship value-tier warranty.
A 7/10 firmness — gentle support without sinking. Good for back and combination sleepers, plus side sleepers over 200 lb.
Built for adaptive support and breathability. Every layer is hand-checked before it ships from our warehouse.
Diamond Mattress is a 4th-generation family-owned company that has been handcrafting mattresses in Southern California since 1946. Founded by the Pennington family in Compton, California (now headquartered in Rancho Dominguez), Diamond is one of the few mattress manufacturers in America that is fully vertically integrated. They make their own pocketed coils, process their own memory foams, and cut and sew their own fabrics — all under one roof. This level of control over every component means Diamond can maintain strict quality standards that outsourced manufacturers cannot match. Every Diamond mattress is CertiPUR-US certified, GREENGUARD Gold certified for low chemical emissions, OEKO-TEX tested for harmful substances, and ECO INSTITUT certified for environmental safety. Diamond also uses REPREVE recycled fibers in select products, demonstrating their commitment to sustainable manufacturing practices.
The Diamond Dreamstage 2.0 Collection Glory Firm Cool Gel Swirl Memory Foam 12" Mattress uses Cool Gel Swirl memory foam, Diamond’s accessible cooling foam technology. The gel is distributed throughout the foam in a swirl pattern that maximizes cooling contact area. While not as aggressively cool as the copper-infused Clarity line or the titanium-based Snowbird line, Cool Gel Swirl provides meaningful temperature regulation at a more accessible price point — noticeably cooler than standard memory foam without the premium pricing of advanced cooling technologies. The 12" all-foam construction delivers deep body contouring and excellent motion isolation, making it a strong choice for sleepers who prefer the feel of foam over innerspring bounce. Diamond processes their own foams in-house at their Southern California factory, maintaining quality control from raw material to finished product. Every mattress is CertiPUR-US certified and GREENGUARD Gold certified for clean, safe materials.
The firm comfort level is designed for back sleepers and stomach sleepers who need a flat, supportive surface that prevents the hips from sinking below neutral alignment. Heavier sleepers (200+ lbs) often prefer firm mattresses because they maintain support under greater body weight without excessive compression. The firm surface also tends to sleep cooler because there is less foam material trapping heat around the body.
As an authorized Diamond dealer, LA Mattress Store carries the complete Diamond lineup in all five of our Los Angeles showrooms — Glendale, West LA, Hancock Park, Koreatown, and Studio City. Walk in any time during business hours to try this mattress in person. Our sleep consultants can help you compare firmness levels, construction types, and find the right mattress for your sleep style and budget. Every purchase includes free White Glove delivery anywhere in the Los Angeles metro area — our team delivers to your room of choice, sets up the new mattress, and removes your old one at no extra cost. Same-day delivery is often available. Diamond offers a 120-night comfort exchange (exchange for a different model if needed) and a 20-year manufacturer warranty — one of the longest in the industry. LA Mattress Store coordinates all warranty claims on your behalf. We also offer 0% APR financing for qualified buyers, making it easy to invest in better sleep without paying the full amount upfront.
Diamond Dreamstage 2.0 Collection Glory Firm Cool Gel Swirl Memory Foam 12" Mattress is available in Twin, Twin XL, Full, Queen, King, CA King. Queen starts at $1,099. All sizes include free White Glove delivery in Los Angeles.
Have questions? Call us at (800) 218-3578 or visit any of our 5 Los Angeles showrooms to try it in person.
