Diamond sells the Sage in six sizes and exactly one feel, so the firmness decision is made for you before you get to pick a size.
Price: $2,099–$3,449 · Verified: 2026-08-19
Diamond sells the Sage in six sizes and exactly one feel, so the firmness decision is made for you before you get to pick a size.
The Sage Organic Latex Hybrid runs $2,099 to $3,449 across six sizes, from Twin up to Cal King, and every one of them is listed as Medium. That is the first thing to settle, because no amount of sizing gets you around a single feel option. If you already know Medium works for you, the rest of the card is about materials and profile. If you do not know, sort that out first.
The build, as Diamond lists it in its own spec block, is organic cotton, wool and Talalay latex at a 12 inch profile, categorized as a latex hybrid. The brand states the materials are CertiPUR-US certified, ethically sourced and free from harmful substances. CertiPUR-US is a real foam certification program, so that part is checkable. The phrase about harmful substances is the brand's own wording, and we are repeating it as their claim rather than as a finding of ours.
What it gives up: firmness choice, profile height, and any named cooling system. Medium is the only feel, so heavier sleepers who want firm support and light side sleepers who want more give both have to look elsewhere in the line. At 12 inches, the Sage sits two inches shorter than the 14 inch Black Diamond and Flurry Lux, which means less room for stacked comfort layers. And unlike its siblings, Diamond does not attach a cooling technology name to the Sage. The Black Diamond gets Ice Flex Cooling Technology, the Flurry Lux gets Cool Stream Lux fabric and cooling graphene foam. The Sage gets latex, wool and cotton, and you are trusting those materials to do the work.
The rest of the line makes the trade clear. Flurry Lux Cooling Hybrid starts at $1,399 and tops out at $1,999, at 14 inches, in Medium or Firm, with a named cooling stack and a euro top. Black Diamond spans $1,899 to $3,799 at 14 inches with Plush, Medium and Firm. So the Sage is neither the cheapest nor the most configurable option Diamond sells. What it has that they do not is the organic cotton, wool and Talalay latex spec.
Diamond has been building mattresses since 1946 and its current line covers memory foam, hybrid and natural latex, so the Sage is one branch of a broader catalog rather than the company's only idea. Buy it because you want the latex and natural fiber build and Medium suits you. Buy something else if the feel, the height or the cooling story is where your decision actually turns.
A buyer who already knows a medium feel works for them and is paying up specifically for the organic cotton, wool and Talalay latex build rather than for cooling tech or firmness options.
Skip it if you are unsure about firmness, since Medium is the only feel offered, or if engineered cooling is your top requirement, since Diamond names a cooling system on the Black Diamond and Flurry Lux but not on the Sage.
Specifications
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Where this fits
Diamond Mattress Sage Organic Latex Hybrid cross-shops across several editorial surfaces on this site: the full brand catalog and the in-depth guides for its category.
Diamond Mattress Sage Organic Latex Hybrid - buyer FAQ
Why is there only one firmness option?
Diamond lists the Sage in Medium alone, across all six sizes, from the $2,099 Twin to the $3,449 Cal King. If Medium is wrong for your body or your sleeping position, the fix is a different model rather than a different order. The Black Diamond runs $1,899 to $3,799 and lists Plush, Medium and Firm.
Is a 12 inch mattress tall enough?
The Sage sits at 12 inches, two inches under the 14 inch Black Diamond and Flurry Lux. A lower profile means standard sheets usually fit without deep pockets, and the bed sits lower on a tall frame. It also means less room for stacked comfort layers, so compare in person if you want deep contour.
What am I actually paying for between $2,099 and $3,449?
You are paying for the materials spec and the size. Diamond lists organic cotton, wool and Talalay latex at a 12 inch profile, and states the materials are CertiPUR-US certified. If the latex and natural fiber build is not the reason you are shopping, the Flurry Lux Cooling Hybrid starts at $1,399 and does a different job.
Does the Sage sleep cool?
Diamond does not attach a cooling technology name to the Sage the way it does elsewhere in the line. The Black Diamond carries Ice Flex Cooling Technology, and the $1,399 to $1,999 Flurry Lux names Cool Stream Lux fabric plus cooling graphene foam. The Sage relies on latex, wool and cotton instead, with no cooling claim from the brand.
What does the CertiPUR-US certification cover here?
CertiPUR-US is a real certification program for foam. Diamond states the Sage uses CertiPUR-US certified materials and describes them as ethically sourced and free from harmful substances, which is the brand's phrasing rather than a test we ran. Since the certification applies to foam components, ask Diamond which layers of the 12 inch build it covers.
Diamond Mattress Sage Organic Latex Hybrid
$2,099–$3,449 · Verified 2026-08-19
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