Luxury Buyer's Guide: Cushion Cut Diamond
Discover how to choose the perfect cushion cut diamond ring, from proportions and quality to setting styles and design considerations.
The cushion cut diamond is one of the most enduring and versatile diamond shapes, combining historical significance with modern refinement. Recognized for its soft, rounded corners and balanced brilliance, the cushion cut offers a distinct alternative to more traditional round diamonds while maintaining strong visual appeal.
This guide outlines the key factors to consider when selecting a cushion cut diamond, including history, proportions, quality considerations, and design variations, helping buyers identify stones that balance character, brilliance, and overall presence.
Key Takeaways: Cushion Cut Diamonds
| Feature | Takeaway |
| Origin | Derived from the Old Mine Cut (1700s), one of the earliest diamond cutting styles |
| Shape | Square or rectangular with rounded corners and large facets |
| Faceting Styles | Standard (58 facets) or modified “crushed ice” brilliance patterns |
| Popularity | Approx. 8–10% of the diamond market; strong demand for larger stones |
| Quality Recommendations | VS or higher clarity; G or better color; balanced proportions |
| Shape Variations | Square ratios (1.00–1.05) or rectangular for increased visual size |
| Colored Diamonds | Cushion cuts enhance color saturation, ideal for pink, yellow, and blue diamonds |
| Collector Appeal | Blend of vintage character, versatility, and strong light performance |
History of the Cushion Cut Diamond
The cushion cut diamond traces its origins to the Old Mine Cut, developed in the 18th century. Designed for candlelight conditions, these early diamonds featured larger facets, high crowns, and deeper pavilions, maximizing brilliance under low lighting.
During the Victorian era, cushion-style diamonds became widely used in jewelry, valued for their soft shape and romantic appearance. By the late 19th and early 20th centuries, advancements in cutting techniques led to more refined symmetry and improved light performance, resulting in the modern cushion cut.
The shape experienced renewed popularity during the Art Deco period, where bold geometry and structured design complemented its larger facets and balanced proportions.
Why Choose a Cushion Cut Diamond
Cushion cut diamonds offer a balance between vintage character and contemporary versatility. Their facet structure produces a combination of brilliance and fire, delivering a softer sparkle compared to round diamonds.
At larger sizes, cushion cuts become especially appealing, as their proportions allow for strong visual presence without excessive sharpness or rigidity. This makes them a popular choice for engagement rings and statement pieces.
Their adaptable shape also works well across a range of settings, from classic solitaires to more intricate designs, including halo or colored gemstone accents.
Understanding Cushion Cut Characteristics
Faceting Style
Cushion cut diamonds typically feature 58 facets, though variations with additional facets are common. These variations influence appearance:
- Standard cushion cuts → larger facets, classic brilliance
- Modified cushion cuts (“crushed ice”) → smaller facets, more scattered sparkle
Proportions
Key measurements to consider include:
- Depth: 60–68%
- Table: 57–65%
- Length-to-width ratio:
- 1.00–1.05 → square
- 1.10+ → rectangular (appears larger)
Balanced proportions help maximize both brilliance and overall symmetry.
How to Select a Cushion Cut Diamond
Focus on Clarity, Color, and Cut
At larger carat weights, the overall quality of a cushion cut diamond becomes more noticeable, making clarity, color, and cut especially important. A clarity grade of VS or higher is typically recommended to ensure inclusions are not visible to the naked eye, while a G color or better helps maintain a bright, near‑colorless appearance.
Cut quality is equally critical, particularly for cushion shapes, where variations in symmetry, polish, and facet arrangement can significantly affect brilliance. Because cushion cuts are less standardized than round diamonds, two stones of similar specifications can appear quite different, making it important to compare multiple options to find a diamond with balanced proportions and strong light performance.
Choose Shape Preference
- Square cushion: balanced, classic
- Rectangular cushion: elongated, appears larger
This choice often comes down to personal preference and desired finger coverage.
Type I and Type II Diamonds
Most diamonds are classified as Type I and contain trace amounts of nitrogen, with Type Ia stones making up the majority of diamonds used in engagement rings. Type II diamonds are significantly rarer and typically exhibit fewer impurities and higher clarity. Among these, Type IIa diamonds are considered the purest, containing no measurable nitrogen or boron and accounting for less than 2% of all mined diamonds.
These stones are known for exceptional transparency and brilliance and are often found in both colorless and rare colored varieties such as pink or blue. A notable example is the Williamson Pink Star, an 11.15‑carat Fancy Vivid Pink Type IIa diamond, which achieved nearly $60M at auction, underscoring the rarity and desirability of this category. Type IIb diamonds, even rarer, contain boron and are responsible for blue or grayish‑blue coloration; the Hope Diamond is a well‑known example of this type.
Cushion Cut Colored Diamonds
Cushion cut diamonds are particularly well suited for colored gemstones, as their faceting enhances saturation and depth of color.
While yellow diamonds are more accessible, pink and blue diamonds are significantly rarer, especially at larger sizes. Cushion cuts help retain and amplify color, making them a preferred choice for many high jewelry designs.
A 3.71‑carat fancy pink diamond sold for nearly $600K in December 2022, demonstrating the premium placed on strong natural color and balanced proportions.
Due to limited supply, flexibility in shape, proportions, and carat weight is often required when sourcing colored cushion diamonds.
Celebrity Cushion Cut Diamond Rings
Cushion cut diamonds are a frequent choice for high-profile engagement rings, particularly at larger carat weights. Notable examples include Kim Kardashian’s original 15‑carat cushion cut diamond, Sofia Vergara’s 7‑carat cushion cut set in a halo, and Chrissy Teigen’s 5–6 carat cushion diamond ring. Zoe Kravitz, Jennifer Garner, and Gabrielle Union have also worn cushion cut engagement rings ranging from approximately 4.5 to 8.5 carats, reflecting the shape’s versatility across sizes.
More recent examples include Karlie Kloss’s 7–8 carat cushion diamond and Gisele Bündchen’s 4‑carat cushion cut ring, further illustrating the continued popularity of this shape among collectors seeking both size and softer design aesthetics.
The Enduring Appeal of Cushion Cut Diamonds
The cushion cut diamond continues to stand apart for its ability to merge historical character with modern versatility. Its distinctive faceting and balanced proportions offer a softer alternative to more conventional diamond shapes, while still delivering strong brilliance and visual presence.
From classic colorless stones to rare colored diamonds, cushion cuts provide a wide spectrum of possibilities, adapting seamlessly across both traditional and contemporary designs. Their variation in faceting styles and proportions also allows for a more individualized selection process, where each stone carries its own unique character.
As a result, cushion cut diamonds remain a consistent choice for both engagement rings and high jewelry, valued for their combination of craftsmanship, adaptability, and enduring design appeal.
Frequently Asked Questions About Cushion Cut Diamonds
Are cushion cut diamonds popular?
Yes. Cushion cut diamonds account for approximately 8–10% of the diamond market and remain a strong choice, particularly for larger stones. Their combination of vintage character and modern versatility makes them especially appealing for engagement rings and high jewelry.
What clarity is best for a cushion cut diamond?
A clarity grade of VS or higher is generally recommended, especially for larger stones, where inclusions can become more visible. Cushion cuts can mask smaller imperfections better than step cuts, but higher clarity ensures a cleaner, more refined appearance.
Are cushion cut diamonds good for colored stones?
Yes. Cushion cuts are well suited for colored diamonds, as their faceting enhances color saturation and depth. This makes them a preferred choice for fancy yellow, pink, and blue diamonds, where maximizing color intensity is essential.
Buy and Sell Diamond Jewelry with Sotheby’s
Whether you're a seasoned collector or new to the world of diamond jewelry, Sotheby’s offers a trusted, seamless way to buy and sell diamonds on the secondary market.
Why Choose Sotheby’s?
- Expertly Vetted Selection
Explore rare and iconic diamond jewelry, from white gold and diamond band rings starting around $4,000 to highly coveted pieces featuring rare colored diamonds or exceptional gemstones commanding significantly higher prices. - Exclusive Global Access
Shop diamond jewelry through auctions and Buy Now marketplace, backed by a worldwide network of collectors, consignors, and trusted suppliers. - Flexible Ways to Buy
Purchase online or in person at our locations in New York, London, Paris, and Hong Kong—or work with a dedicated jewelry concierge for tailored assistance. - Exceptional Value
Every piece of diamond jewelry is authenticated and priced by Sotheby’s specialists to reflect true market value. - Constantly Evolving Inventory
Discover vintage and modern diamond rings, necklaces, and bracelets across all price points, with new pieces added regularly.
Ready to Get Started?
- Browse Sotheby's upcoming jewelry auctions in New York, London, Switzerland, Paris, and Hong Kong
- Shop Sotheby's Buy Now jewelry for instant access to available inventory
- Speak with a Sotheby's jewelry specialist to consign or request a valuation for a Rolex watch
Trust our worldwide network of leading jewelry specialists from a globally renowned auction house established in 1744.
