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4-Carat Round Brilliant Diamond Price Guide

Updated on July 7, 2024

With over 40 years of expertise, Diamond Registry’s CEO and owner, Nissan Perla, is your trusted guide in the diamond-buying world. Recognized by prestigious publications like The Washington Post and Chicago Tribune, Nissan’s extensive knowledge and experience in evaluating, buying, and selling diamonds are unparalleled. Our commitment to integrity, transparency, and delivering exceptional value ensures that you make an informed decision when acquiring your timeless treasure. Choose Diamond Registry for personalized guidance, education, and a curated selection of the finest quality diamonds, backed by decades of industry expertise and dedication to your satisfaction.

Table of Contents

Published on July 7, 2024
Updated on July 7, 2024

4-carat round brilliant diamonds offer impressive size and sparkle, but their price can vary significantly. 

This guide shows the key factors influencing the cost of these sought-after gems, helping you make a smart purchase decision. 

We’ll cover essential considerations to ensure you get the best value for your investment in a 4-carat round diamond.

4-Carat Round Brilliant Diamond

Price Range for 4-Carat Round Brilliant Diamonds

The price of 4-carat round brilliant diamonds can vary significantly based on several factors, primarily the 4Cs: cut, color, clarity, and carat weight. On average, prices for these diamonds typically range from $30,000 to $200,000 or more.

At the lower end of the spectrum, you might find 4-carat round brilliants with lower color grades (K-M) and clarity grades (SI1-I1) priced around $30,000 to $50,000. 

Mid-range options with better color (G-J) and clarity (VS1-SI2) can cost between $50,000 and $100,000. Premium 4-carat round brilliants with excellent cut, high color grades (D-F), and top clarity ratings (IF-VVS2) can command prices from $100,000 to $200,000 or more.

Here’s a table of the approximate price ranges based on color and clarity for 4-carat round brilliant diamonds:

ColorClarityPrice Range
D-FIF-VVS2$150,000 – $200,000
G-HVS1-VS2$100,000 – $150,000
I-JSI1-SI2$60,000 – $100,000
K-MSI2-I1$30,000 – $60,000

Note that these are general ranges, and actual prices can vary based on the specific characteristics of each diamond and market conditions.

Please note that this is an estimation only by our expert. Contact us to get more information and consultation.

Cut Quality

Cut quality is paramount when evaluating a 4-carat round brilliant diamond, significantly impacting both its beauty and price. A well-cut diamond maximizes light return, creating the fire and brilliance that make these gems so captivating.

For 4-carat round brilliants, even small variations in cut quality can lead to substantial price differences. Excellently cut diamonds command premium prices, often 20-30% higher than those with good or very good cuts. This price increase is justified by the superior visual performance of well-cut diamonds.

When assessing cut quality, consider these factors:

  1. Symmetry: Ensures facets align properly for optimal light reflection.
  2. Polish: A smooth surface allows better light entry and reflection.
  3. Depth percentage: Ideally between 59-62.5% for round brilliants.
  4. Table percentage: Typically 54-57% for optimal light return.

Investing in a high-quality cut can significantly enhance the diamond’s appearance, making it appear larger and more brilliant than lower-quality cuts of the same carat weight.

Diamond Cuts


Color grading plays a crucial role in determining the price of 4-carat round brilliant diamonds. The color scale for white diamonds ranges from D (colorless) to Z (light yellow or brown), with D being the most valuable.

In 4-carat diamonds, color differences become more noticeable due to the larger size, making higher color grades particularly desirable. This visibility factor often leads to steeper price increases between color grades compared to smaller diamonds.

Price implications of color grades for 4-carat round brilliants:

  • D-F (Colorless): Command the highest prices, often 30-50% more than G-H diamonds.
  • G-H (Near Colorless): Offer a balance of quality and value, popular for larger diamonds.
  • I-J: Present noticeable warmth, with prices 20-30% lower than G-H.
  • K-M: Show visible yellow tints, priced significantly lower, often 40-50% less than G-H.

When selecting a color grade, consider the setting metal. Yellow gold can mask lower color grades, potentially allowing for cost savings, while platinum or white gold settings may require higher color grades to maintain a white appearance.


Clarity refers to the presence of internal (inclusions) or external (blemishes) imperfections in a diamond. The clarity scale ranges from Flawless (FL) to Included (I3), with higher grades commanding higher prices.

For 4-carat round brilliant diamonds, clarity becomes increasingly important due to the larger size, which can make inclusions more visible. This visibility factor often results in more pronounced price differences between clarity grades compared to smaller diamonds.

Clarity grade impact on 4-carat round brilliant prices:

  • FL-VVS2: Premium prices, often 20-30% higher than VS1-VS2 grades.
  • VS1-VS2: Popular choices, balancing clarity and value.
  • SI1-SI2: Can offer significant savings (20-40% less than VS grades) if inclusions are not eye-visible.
  • I1-I3: Substantially lower prices, but inclusions may affect brilliance and durability.

When evaluating clarity, consider that the round brilliant cut is adept at masking inclusions. This characteristic allows for some flexibility in choosing clarity grades, potentially leading to cost savings without compromising visual appeal.

Carat weight

At 4 carats, round brilliant diamonds are significantly larger than average and command premium prices. The price per carat increases exponentially with size, making 4-carat diamonds disproportionately more expensive than smaller stones of similar quality.

Key points about 4-carat pricing:

  1. Price jump: Expect a substantial price increase from 3 to 4 carats, often 30-50% or more.
  2. Rarity factor: 4-carat diamonds are less common, contributing to higher prices.
  3. Quality premium: Higher quality (cut, color, clarity) becomes more critical and expensive at this size.

Estimated Price Comparison:

  • 1-carat round brilliant: $5,000 – $20,000
  • 2-carat round brilliant: $15,000 – $80,000
  • 3-carat round brilliant: $30,000 – $150,000
  • 4-carat round brilliant: $30,000 – $200,000+

This exponential price increase reflects the rarity and desirability of larger diamonds. When budgeting for a 4-carat diamond, consider that small compromises in color or clarity can lead to significant savings without necessarily impacting visual appeal.

Why Should You Buy a 4-Carat Round Brilliant Diamond?

Investing in a 4-carat round brilliant diamond offers several compelling advantages:

  1. Impressive size: A 4-carat diamond makes a bold statement, standing out in any setting.
  2. Optimal light performance: The round brilliant cut maximizes sparkle and fire, especially noticeable in larger sizes.
  3. Timeless appeal: Round brilliants remain consistently popular, maintaining value over time.
  4. Versatility: Suits various settings and styles, from classic solitaires to elaborate designs.
  5. Investment potential: Larger, high-quality diamonds often appreciate in value over time.
  6. Rarity: 4-carat diamonds are less common, adding to their uniqueness and value.
  7. Flexibility in the 4Cs: The size allows for some compromise in other areas (like clarity or color) without significant visual impact.
  8. Status symbol: Represents a significant investment and often carries social prestige.

However, consider the higher cost and potential practical limitations (like wearability in certain settings) before making this substantial purchase.

4-Carat Round Brilliant Diamond Price

What 4-Carat Round Brilliant Diamond is Best For

4-carat round brilliant diamonds are versatile and suitable for various applications:

  1. Engagement rings: Make a grand statement with a show-stopping center stone.
  2. Statement jewelry: Ideal for pendant necklaces or striking earrings.
  3. Investment pieces: High-value diamonds for collectors or as financial assets.
  4. Heirloom creation: Substantial diamonds to pass down through generations.
  5. Luxury gifts: For significant milestones or celebrations.
  6. Cocktail rings: Create bold, eye-catching designs.
  7. Custom Jewelry: Allows for unique, personalized creations.
4-Carat Round Brilliant Diamond  Ring

When choosing the best use for a 4-carat round brilliant, consider:

  • Personal style and preferences
  • Lifestyle and practicality of wear
  • Budget constraints
  • Long-term value and potential for appreciation

The versatility of the round brilliant cut ensures that a 4-carat diamond can be adapted to suit various tastes and purposes, making it a valuable and flexible investment.

Buying Tips for 4-Carat Round Brilliant Diamonds

  1. Prioritize cut quality: Opt for excellent or ideal cut grades to maximize brilliance and fire.
  2. Balance the 4Cs: Consider slight compromises in color or clarity to stay within budget without sacrificing overall beauty.
  3. Verify certification: Insist on reputable grading reports (GIA or AGS) to ensure accuracy of quality claims.
  4. Examine for fluorescence: Strong fluorescence can affect price and appearance; consider its impact carefully.
  5. Compare prices: Shop from multiple reputable dealers to ensure competitive pricing.
  6. Consider clarity carefully: VS2-SI1 clarity grades often offer the best value, appearing clean to the naked eye.
  7. Assess color in person: Color differences can be subtle; view diamonds in various lighting conditions if possible.
  8. Evaluate symmetry and polish: These factors contribute significantly to a diamond’s overall appearance.
  9. Check for inclusions: Request detailed plots or images to understand the nature and location of any inclusions.
  10. Consider the setting: Choose a setting that complements and secures the large stone effectively.
  11. Negotiate: Given the high value, there may be room for price negotiation, especially with independent jewelers.
  12. Understand return policies: Ensure the seller offers a reasonable return period for such a significant purchase.
  13. Insurance: Factor in the cost of insuring such a valuable item.
  14. Consider origin: Some buyers prefer natural diamonds, while others opt for lab-grown for ethical or budget reasons.
  15. Think long-term: Consider how the diamond will fit your lifestyle and if it’s a piece you’ll cherish for years to come.

4-Carat Round Brilliant Diamonds in Engagement Rings

4-carat round brilliant diamonds make stunning centerpieces for engagement rings, offering both visual impact and symbolic significance. However, their size and value come with unique considerations for daily wear.


  1. Dramatic visual impact
  2. Symbol of significant commitment
  3. Excellent light performance and sparkle
  4. Versatile shape that suits various setting styles
  5. Potential for appreciation in value


  1. High cost may limit other aspects of wedding planning
  2. Can be impractical for certain lifestyles or professions
  3. May snag on clothing or objects
  4. Requires extra care and attention to avoid damage or loss
  5. Can overwhelm smaller hands or appear ostentatious in some settings

For daily wear, consider:

  • Secure settings: Six-prong or bezel settings offer extra protection.
  • Ring height: A lower profile setting may be more practical for daily activities.
  • Metal choice: Platinum or 14k gold provides durability for everyday use.
  • Insurance: Essential for such a valuable piece.
  • Regular maintenance: Professional cleaning and prong checks are crucial.

While a 4-carat round brilliant engagement ring is undoubtedly impressive, it’s essential to balance the desire for a show-stopping ring with practical considerations for long-term wear and enjoyment.

Where to Buy 4-Carat Round Brilliant Diamonds

When purchasing a 4-carat round brilliant diamond, choosing the right retailer is crucial. Consider these options:

  1. Online diamond retailers:
    • Advantages: Competitive pricing, extensive inventory, detailed information
    • Examples: Blue Nile, James Allen, Brilliant Earth
    • Prices: Often 20-40% lower than traditional jewelers
  2. Traditional brick-and-mortar jewelers:
    • Advantages: In-person viewing, personalized service, immediate gratification
    • Considerations: Higher overhead often results in higher prices
    • Prices: Can be 20-50% higher than online retailers
  3. Luxury brand jewelers:
    • Advantages: Prestige, unique designs, high-quality craftsmanship
    • Considerations: Significant premium for brand name
    • Prices: Often 50-100% higher than non-branded options
  4. Diamond wholesalers:
    • Advantages: Potential for better pricing, access to a wide selection
    • Considerations: May require industry connections, less customer-oriented service
    • Prices: Can offer savings of 10-30% compared to retail
  5. Auction houses:
    • Advantages: Access to rare or unique pieces, potential for good deals
    • Considerations: Requires expertise, may involve additional fees
    • Prices: Highly variable, potential for both bargains and premium prices
  6. Lab-grown diamond retailers:
    • Advantages: Significantly lower prices, ethical considerations
    • Considerations: Different long-term value proposition than natural diamonds
    • Prices: Often 50-70% less than comparable natural diamonds

When choosing a retailer, consider:

  • Reputation and reviews
  • Certification and grading standards
  • Return and warranty policies
  • Customer service quality
  • Price Transparency
  • Ability to view the diamond (in person or through high-quality imaging)

For a purchase of this magnitude, it’s advisable to research thoroughly, compare options from multiple retailers, and possibly consult with a trusted gemologist before making a final decision.

How Big Is a 4-carat Diamond Round Brilliant?

A 4-carat round brilliant diamond is a substantial gem that makes a significant visual impact. To understand its size:

Approximate dimensions:

  • Diameter: 10.0-10.4 mm
  • Depth: 6.0-6.2 mm

For context:

  • A US quarter is 24.26 mm in diameter
  • A 4-carat round brilliant is about 41-43% the diameter of a quarter

Compared to other common carat weights:

Carat WeightApproximate Diameter
1 carat6.4-6.5 mm
2 carat8.1-8.2 mm
3 carat9.3-9.4 mm
4 carat10.0-10.4 mm

Visual size factors:

  1. Cut quality: Excellent cuts can appear larger due to better light performance.
  2. Setting style: Certain settings (e.g., halo) can enhance the perceived size.
  3. Finger size: The same diamond may appear larger on a smaller finger.
  4. Surrounding stones: Smaller side stones can make the center diamond look larger.

While a 4-carat diamond is noticeably large, its actual appearance can vary based on these factors. When considering a 4-carat round brilliant, it’s helpful to view it in person or use size comparison tools to gauge its true visual impact.

Comparing 4-Carat Round Brilliant Diamond to Other Shapes

A. Price differences

Round brilliant diamonds typically command higher prices compared to other shapes of the same carat weight due to their popularity and the amount of rough diamonds lost during cutting. Here’s a general comparison of 4-carat diamond prices across different shapes:

  1. Round Brilliant: Base price (100%)
  2. Oval: 10-15% less than round
  3. Princess: 15-25% less than round
  4. Cushion: 15-25% less than round
  5. Emerald: 20-30% less than round
  6. Pear: 10-20% less than round
  7. Marquise: 10-20% less than round
  8. Radiant: 15-25% less than round
  9. Asscher: 15-25% less than round
  10. Heart: 10-15% less than round

These percentages are approximate and can vary based on specific diamond characteristics and market conditions. The price difference becomes more pronounced at larger carat weights like 4 carats.

B. Visual size differences

While all these shapes may be 4 carats, they can appear different in size due to their proportions and how they distribute carat weight. Here’s a comparison of how 4-carat diamonds in different shapes might appear:

  1. Round Brilliant: Approximately 10.0-10.4 mm diameter
  2. Oval: Typically appears larger, around 12 x 8 mm
  3. Princess: Square shape, about 8.5-9 mm per side
  4. Cushion: Similar to princess, but with rounded corners
  5. Emerald: Rectangular, approximately 10 x 7.5 mm
  6. Pear: About 14 x 9 mm, appears larger due to elongated shape
  7. Marquise: Elongated, around 16 x 8 mm, largest face-up appearance
  8. Radiant: Similar to emerald but with brilliant faceting
  9. Asscher: Square with
  10. Heart: Approximately 10-11 mm in length, unique shape affects perceived size

Factors affecting visual size:

  1. Length-to-width ratio: Elongated shapes like oval, pear, and marquise often appear larger than their actual carat weight.
  2. Depth percentage: Shallower cuts can have a larger face-up appearance but may sacrifice some brilliance.
  3. Table size: Larger table facets can increase the perceived size of the diamond.
  4. Setting style: Certain settings, like halos or bezels, can influence the diamond’s apparent size.

When comparing shapes, consider that while some may appear larger, the round brilliant’s superior light performance often compensates for any size difference, creating a more brilliant and fiery appearance.

Diamond Registry’s Expert Opinion

Our expert opinion is that a 4-carat round brilliant diamond can be an excellent choice for those seeking a significant and valuable gem, provided careful consideration is given to quality factors and the purchase is made from a reputable source.

Final Thoughts

Investing in a 4-carat round brilliant diamond is a significant decision that requires careful consideration of various factors. 

A 4-carat round brilliant diamond can be a stunning and valuable acquisition. By approaching the purchase with knowledge, careful consideration, and a clear understanding of your priorities, you can find a diamond that not only meets your aesthetic desires but also represents a sound investment. 

Remember, the perfect diamond brings you joy and aligns with your personal values and financial considerations.

Have any questions? Contact us!

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Rebecca Schott
Rebecca Schott
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Nissan, David and his team were extremely accommodating, understanding and patient with our purchase. They took the upmost care to find the best solution for our needs and went above and beyond normal ‘customer service’ standards. I have absolutely no qualms recommending their products and services. Both were absolutely flawless. I will continue to sing them praises and will most definitely purchase from them again in the future. Thank you again!
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Gershom Menachem
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Great team of diamond experts who show personal care for the client’s needs and aftersales service. They really go the extra mile to make it happen no matter the challenges ahead. Rush orders, international shipping, upgrade service, jewelry repair, large diamonds, small items, precious stones. Very honest and open information to the clients. You will feel like talking to a friend.
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Thom P.
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Bought a beautiful stone here for an engagement ring. I was a little apprehensive since you’re buying something unseen. But Cid made it easy. In fact, Nissan, the owner also gave a call to make me more comfortable. They sent me the stone to take to a local jeweler with only my Amex in case I bailed on them.

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