Posted by Treasured & Co. on 8th May 2026
2.5 Carat Cushion Cut Diamond Engagement Ring Set
A One-Ring Spotlight · By the Treasured & Co. Editorial Team · Handcrafted in Astoria, New York · since 1989
- 2.5 carat natural cushion cut diamond center · earth-mined, with diamond grading documentation
- 2.85 total carat weight · diamond side stones and accents framing the center
- Matching wedding band included · designed to sit flush against the engagement ring
- 14kt yellow gold · the historical metal for cushion cuts, pairs with warm light return
- One of a kind · handcrafted in Astoria, NY since 1989 · free U.S. shipping · 30-day returns
Why a 2.5 Carat Cushion Cut Reads as Heritage
Cushion cuts have been around since the early 1700s. They predate the round brilliant by more than a century, predate the princess cut by nearly three. When you look at a 2.5-carat cushion cut diamond engagement ring, you're not looking at a contemporary fashion choice — you're looking at the diamond cut that sat in royal vaults, on aristocrats' fingers, and in estate auctions for the better part of three hundred years before round brilliants were invented.
That history shows up visually. Cushion cuts have a softer, more romantic silhouette than the sharp 90-degree corners of a princess cut or the architectural facet pattern of an emerald cut. The pillow-shaped outline, the warm fire under low light, the way the stone glows rather than dazzles — these are the visual signatures that define vintage and Edwardian engagement-ring aesthetics. Half the diamonds in your grandmother's jewelry box are probably cushion cuts.
This particular piece pairs that heritage cut with a thoroughly modern setting: a 2.5-carat natural, earth-mined cushion cut diamond center stone, framed with diamond side stones, set in 14kt yellow gold, sold as a complete bridal set with matching band. The price tier — starting at $1,800 — sits well below where 2.5-carat natural cushion cut engagement rings typically retail.
The Detail That Carries the History
Three hundred years of cushion cut tradition.
One ring, made by hand.
Center · 2.5 ct Natural Cushion · Diamond Side Stones
Look closely at the setting above. The cushion cut center sits low against the band, framed by smaller round diamond accents on either side. The setting is deliberately simpler than a halo design — it doesn't crowd the center stone with a circle of pavé. Instead, the side stones step up gradually toward the center, drawing the eye directly to the cushion. This is how cushion cuts were set for two centuries before halos became fashionable. It still works.
On the Hand
How It Wears
The studio shots tell you what the ring is. This tells you how it actually wears.
Engagement Ring · Worn A 2.5-carat cushion cut measures approximately 7.5 × 7 mm. On the hand, it reads as substantial without crossing into "costume" — fine-jewelry weight in a daily-wearable proportion.
The Cut
What Is a Cushion Cut Diamond?
A cushion cut diamond is a square or slightly rectangular diamond with rounded corners and 58 to 64 facets. The silhouette is also called a "pillow cut" because of its shape. The cut originated in the early 1700s as the "old mine cut" and was the dominant diamond cut for engagement rings and statement jewelry from the Georgian era through the Victorian and Edwardian periods — roughly 1750 to 1920 — before being partly displaced by the round brilliant cut in the 20th century.
The visual signature of a cushion cut is warmth and fire rather than the bright sparkle of a round brilliant. Cushion cuts return more colored light (the rainbow flashes called "fire") and slightly less white light (called "brilliance"). Under candlelight, dim restaurant lighting, or warm interior light, this character becomes pronounced — cushion cuts genuinely glow. Under bright daylight, they read softer and more romantic than rounds or princess cuts.
Many of the world's most famous diamonds are cushion cuts: the Hope Diamond, the Tiffany Yellow, the Regent. The cut isn't a passing trend — it's a 300-year-old tradition that continues for a reason.
The Size
How a 2.5 Carat Cushion Cut Reads on the Finger
A 2.5-carat cushion cut diamond measures roughly 7.5 × 7 mm. To put that in context: a 2-carat round brilliant measures about 8 mm in diameter; a 2.5-carat cushion is slightly more compact in length but covers a similar amount of finger surface because the stone's depth distributes the carat weight more evenly. A 2.5-carat oval at 10.5 × 7 mm reads more elongated; a 2.5-carat emerald cut at similar dimensions reads more linear.
For most hands, 2.5 carats is the sweet spot: substantial enough to read as a serious engagement ring at any distance, small enough to wear daily without catching on every sweater. It's the carat weight where 'big enough' and 'still wearable' overlap — and it's why the 2.0–3.0 carat tier is the most-shopped fancy-shape engagement ring range globally.
The Stone
Natural Diamond, Not Lab-Grown
The center diamond in this ring is a natural, earth-mined cushion cut diamond — not a lab-grown stone. Both natural and lab-grown diamonds are real diamonds (chemically and physically identical), but they appeal to different buyers for different reasons.
This Ring · Natural
Earth-Mined Diamond
Formed deep underground over 1–3 billion years. Carries documented origin and provenance. Holds historical resale value (the diamond market has tracked natural-diamond prices since the 1880s). The traditional engagement-ring choice. Slightly higher price per carat.
Alternative · Lab-Grown
Created Diamond
Formed in a lab over weeks via CVD or HPHT processes. Chemically and visually identical to mined diamonds. No provenance or geological origin. 30–60% lower price per carat. Better value, but no resale market history.
For buyers who prioritize the traditional engagement-ring narrative — the heritage value, the documented provenance, the "real diamond from the earth" framing — this natural cushion is the right answer. For buyers focused on maximum carat weight per dollar, our 2.5 carat lab-grown oval is positioned for that buyer instead.
The Metal
Why 14kt Yellow Gold for a Cushion Cut
14kt yellow gold (58.3% pure gold) is the metal of choice for cushion cut engagement rings — and not just for trend reasons. Cushion cuts naturally return warmer-toned light than round brilliants because of how their facet pattern interacts with surrounding light. Set in white gold or platinum, that warmth gets fought by the cool metal; the stone reads slightly muted. Set in yellow gold, the warmth gets reinforced — the cushion's natural fire and yellow gold's color both occupy the same warm range of the spectrum.
Historically, virtually every Edwardian and Victorian-era cushion cut engagement ring was set in yellow gold for exactly this reason. The metal choice on this piece isn't a styling decision — it's the structurally correct match for the cut's optical character.
The Full View
The Set, From Every Angle
Four shots at full resolution — top, front, angle, and the engagement ring with matching band shown together.
Specifications
| Center stone | 2.5 carat natural cushion cut diamond (Mohs 10) |
|---|---|
| Side stones | Round natural diamonds (accent stones) |
| Total carat weight | 2.85 tcw |
| Setting | Cushion cut with side stones · low profile |
| Metal | 14kt yellow gold (hallmarked) |
| Includes | Engagement ring + matching wedding band (bridal set) |
| Crafted in | Astoria, New York · by hand · since 1989 |
| Documentation | Diamond grading documentation included |
| Resizing | One free resize within 60 days |
| Shipping | Free across the U.S. · ships insured · 2-day expedited available |
| Returns | 30 days, unworn condition |
| One of a kind | Yes — when this piece sells, it will not be re-made |
Cushion Cut vs Other Popular Diamond Shapes
If you've narrowed to "fancy shape but not sure which one," here's how the cushion fits against the alternatives most engagement-ring buyers consider.
| Cut | Reads as | Best for buyers who want… |
|---|---|---|
| Cushion | Vintage, romantic, warm | Heritage feel, fire under low light, soft silhouette |
| Round brilliant | Classic, bright, neutral | Maximum sparkle, the safest choice, never out of style |
| Oval | Modern, elongating, on-trend | The cut to look bigger than it is, finger-elongating |
| Princess | Modern, architectural, sharp | Geometric clean lines, contemporary aesthetic |
| Emerald | Architectural, art deco, clear | Subtlety, clarity over fire, vintage Hollywood |
| Radiant | Hybrid emerald-meets-round | Architectural shape with brilliant sparkle |
Frequently Asked Questions
How big does a 2.5 carat cushion cut diamond look on the hand?
Approximately 7.5 × 7 mm. On a typical size 6 hand, it covers about half the finger and reads as a substantial statement stone — slightly more compact than a 2.5-carat oval (10.5 × 7 mm) but with significantly more fire under warm light.
What is a cushion cut diamond?
A square or slightly rectangular diamond with rounded corners and 58–64 facets. Originated in the early 1700s and dominated engagement-ring design through the Edwardian era. Known for warm fire and romantic vintage character.
Are cushion cut diamonds popular for engagement rings?
Yes — third most-shopped fancy shape after oval and round. Particularly favored by buyers wanting a vintage or romantic aesthetic. Kim Kardashian, Sofia Vergara, and Meghan Markle have all worn cushion cut engagement rings.
How much does a 2.5 carat cushion cut diamond engagement ring cost?
Natural 2.5ct cushion: typically $5,000–$25,000+ retail. This piece (natural diamond + side stones + matching band + 14kt yellow gold) starts at $1,800 — substantially below typical retail because it's a one-of-a-kind workshop piece.
Is the diamond in this ring natural or lab-grown?
Natural, earth-mined. Carries traditional provenance and historical resale value that lab-grown stones do not.
What is a bridal set?
An engagement ring sold together with a matching wedding band designed to sit flush against it. This piece includes both — so the matching band doesn't need to be separately sourced after the proposal.
What's the difference between a cushion and princess cut?
Both are square-ish, but cushions have rounded corners (vintage, warm, fire-focused) while princess cuts have sharp 90-degree corners (architectural, modern, brightness-focused). Cushion reads romantic; princess reads contemporary.
Why 14kt yellow gold?
Cushion cuts return warmer-toned light than other cuts. Yellow gold reinforces that warmth, where white metals fight against it. Almost all Edwardian-era cushion engagement rings were set in yellow gold for this reason.
Can the engagement ring and band be ordered separately?
Yes. The engagement ring can be ordered alone (without the matching band) for buyers who prefer to source their own band or who want the engagement ring as a standalone piece. Contact our team for separate pricing.
Where is this ring made?
Handcrafted in our Astoria, New York workshop, where Treasured & Co. has operated since 1989. Free U.S. shipping; in-person fittings by appointment at 30-06 Steinway St.
One of a Kind · Currently Available
2.5 Carat Natural Cushion Cut Diamond Engagement Ring Set
Natural Diamond · Side Stones · 14kt Yellow Gold · Matching Band Included
Reserve This Set →Three centuries of cushion cut tradition. One natural diamond.
The kind of engagement ring that doesn't date.
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