The Diamond Dreamstage 2.0 Collection Tranquility Firm Titanium Memory Foam Tight Top Mattress is a firm innerspring 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 16", it sits in the premium 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 foam-encased perimeter lets you use the full sleep surface — and sit on the edge to dress.
A reinforced center third keeps the spine aligned across every position.
A tall comfort and support stack means more contour up top and stronger lumbar push-back below.
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 Tranquility Firm Titanium Memory Foam Tight Top 16" Mattress combines titanium memory foam with a traditional innerspring support system. Titanium-infused memory foam provides enhanced thermal conductivity compared to standard memory foam or gel-infused alternatives. The titanium particles move heat away from the body, providing the body-contouring pressure relief of memory foam without the heat retention that many foam sleepers experience. The 16" innerspring coil system provides the responsive, bouncy foundation that distinguishes innerspring mattresses from all-foam designs. The coils allow continuous airflow through the mattress core, further enhancing the cooling performance. The tight-top construction provides the firmest surface in the Tranquility line, with minimal cushioning above the coil system for direct, flat support. Diamond manufactures their own coils in their California factory, controlling the gauge, count, and zoning for optimal support.
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 Tranquility Firm Titanium Memory Foam Tight Top 16" Mattress is available in Twin, Twin XL, Full, Queen, King, CA King. Queen starts at $1,799. 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.
