The Diamond Dreamstage 2.0 Collection Clarity Firm Cool Copper Gel Memory Foam Mattress is a firm memory-foam mattress built for back and stomach sleepers, and plus-size sleepers. Diamond Mattress is family-owned and California-built — every model is hand-assembled in Chino with CertiPUR-US foams and OEKO-TEX natural fibers. At 13", it sits in the standard profile range — generous enough for adjustable bases yet still easy to sheet.
Hand-assembled in California with domestic steel coils and CertiPUR-US foams.
A breathable quilt and gel-infused top draws heat away so you don't wake up hot.
A reinforced center third keeps the spine aligned across every position.
We deliver, set up in your bedroom, and haul away your old mattress — no extra charge.
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 Clarity Firm Cool Copper Gel Memory Foam 13" Mattress uses copper-infused cool gel memory foam, combining two cooling technologies in one material. Copper naturally conducts heat, drawing warmth away from the body more effectively than standard foam. Copper is also a proven antimicrobial material — it actively inhibits the growth of bacteria, mold, and mildew on the sleep surface without chemical treatments, keeping the mattress fresher and cleaner over its lifespan. The cool gel infusion adds additional thermal regulation by absorbing and distributing heat evenly across the sleep surface. The high-density support foam base provides the foundation for the all-foam construction, delivering deep body contouring and maximum motion isolation. Diamond processes their own foams in their Southern California factory, controlling the copper infusion process for consistent quality across every mattress.
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 Clarity Firm Cool Copper Gel Memory Foam 13" Mattress is available in Twin, Twin XL, Full, Queen, King, CA King. Queen starts at $1,299. 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.
