The Diamond ProGel Medium Gel Memory Foam Mattress is a medium memory-foam mattress built for combination sleepers and most body types. 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 10", 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.
Each coil moves on its own, so a partner getting up doesn't roll you out of position.
We deliver, set up in your bedroom, and haul away your old mattress — no extra charge.
A 5/10 firmness — soft enough to relieve pressure on shoulders and hips, firm enough to keep your spine in line. Most-recommended firmness for combination sleepers.
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 ProGel Medium Gel Memory Foam 10" Mattress is built in Diamond’s Southern California factory using their proprietary manufacturing processes. Diamond is one of the few mattress companies that makes their own pocketed coils, processes their own memory foams, and sews their own fabrics in-house. This vertical integration gives them direct control over every component and the ability to innovate faster than brands that rely on third-party suppliers. The mattress features CertiPUR-US certified foams, ensuring they meet strict standards for content, emissions, and durability. GREENGUARD Gold certification confirms low chemical emissions for a healthier indoor environment.
The medium comfort level is the most versatile option, designed for combination sleepers who shift between back, side, and stomach positions during the night. It provides enough cushioning for comfortable side sleeping without being so soft that back and stomach sleepers lose spinal alignment. Medium is typically the safest starting point for sleepers who are unsure which firmness they prefer, and it is the most common choice for couples who have different firmness preferences.
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 ProGel Medium Gel Memory Foam 10" Mattress is available in Twin, Twin XL, Full, Queen, King, CA King. Queen starts at $1,039. 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.
