Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Black Diamond
Beautyrest Black C-Class
Comfort
9/10
9/10
Support
8.8/10
9.2/10
Cooling
9.4/10
9.4/10
Edge Support
8.5/10
9.3/10
Motion Isolation
8.7/10
8.9/10
Durability
9/10
9.2/10
Value
8.2/10
8.3/10
Quick Specs Comparison
Spec
Black Diamond
Beautyrest Black C-Class
Price (Queen)
$2,599
$2,999
Type
Hybrid
Hybrid
Firmness
5/10
6/10
Height
14"
14.5 inches
Trial
120 nights
100 nights
Warranty
20-year limited
10 years
Shipping
Free delivery
Free white glove delivery
Key Advantages
Why Choose Black Diamond
- Ice Flex Cooling Technology provides outstanding temperature regulation
- Premium hybrid construction with individually wrapped coils for targeted support
- Multiple comfort options (Plush, Medium, Firm) to match your preference
Why Choose Beautyrest Black C-Class
- Best cooling in the Black lineup
- Versatile medium-firm feel suits most sleepers
- BlackICE 4.0 + RightTemp foam combo