A protector keeps the warranty valid from night one — and it all rides along with your white-glove delivery, no extra trip.
The Diamond Dreamstage Value Collection Topaz Firm 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 7", 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 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.
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.
The Topaz is the entry point to Diamond's Dreamstage Value Collection: a 7-inch firm innerspring mattress with a smooth tight-top sleep surface and CertiPUR-US certified comfort foam over a supportive coil core, handcrafted in Diamond's Southern California factory. The low 7-inch profile makes it a natural fit for bunk beds, daybeds, trundles, and platform frames where a full-height mattress sits too tall.
Pick the Topaz for kids' rooms, guest rooms, and rental units that need a solid firm mattress at a Queen-from-$399 price, or anywhere a slim profile matters. The firm tight-top surface suits back and stomach sleepers who want flat, even support without pillowy sink.
Diamond Dreamstage Value Collection Topaz Firm Tight Top 7" Mattress is available in Twin, Full, Queen, King, CA King, Twin XL. White Glove delivery is free in Los Angeles on orders over $499.
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.
It has a firm feel, 7 out of 10 on our scale where 1 is the softest. It is a good fit for side sleeping, great fit for back sleeping, and great fit for stomach sleeping.
From top to bottom it is built from Quilted comfort top, Comfort foam layers, Pocketed (or offset) coils, and Foam-encased perimeter in a 7-inch profile. A plush quilt that softens the surface feel.
It suits: Back and stomach sleepers; Plus-size sleepers needing lift; Sleepers with chronic lower-back pain; Hot sleepers (less foam to trap heat). It is a weaker fit for: Side sleepers under 150 lb (shoulder pressure); Sleepers wanting cushioned pressure relief.
Yes, free white-glove delivery anywhere in Los Angeles on orders over $499, including setup and free haul-away of your old mattress. Order by 4pm for same-day delivery.
You have our 120-night comfort exchange. Sleep on it for at least 30 nights, and if it isn't right, exchange it for another mattress, we handle the pickup and redelivery.
Yes, 0% APR financing through Synchrony on approved credit, plus Acima lease-to-own with no credit needed. Most applicants are approved in minutes at checkout or in any showroom.
Yes, our Los Angeles showrooms in Koreatown, West LA, La Brea, Studio City, and Glendale carry our lineup on the floor. Walk-ins welcome, no appointment needed.
