How Much Is A 20 Carat Diamond Worth?

Diamonds have captivated people for centuries with their scintillating beauty. If you have wondered, how much would a large, high quality diamond cost? Let’s explore the factors that determine the value of a 20 carat diamond.

If you’re short on time, here’s a quick answer to your question: A high quality 20 carat diamond can be worth between $200,000 to over $3 million.

What Impacts the Value of a Diamond

When determining the value of a diamond, several factors come into play. These factors include carat, clarity, color, and cut. Each of these characteristics contributes to the overall quality and desirability of the diamond, ultimately affecting its worth.


The carat weight of a diamond refers to its size, with one carat equal to 200 milligrams. Generally, the larger the diamond, the higher its value. However, it’s important to note that carat weight alone doesn’t determine a diamond’s worth. Other factors, such as the diamond’s quality and the demand for certain carat sizes, also play a significant role in determining its value.


The clarity of a diamond refers to the presence of any internal or external flaws, known as inclusions and blemishes, respectively. The fewer imperfections a diamond has, the higher its clarity grade. Diamonds with higher clarity grades are rarer and more valuable. The Gemological Institute of America (GIA) has a clarity scale that ranges from Flawless (no inclusions or blemishes visible under 10x magnification) to Included (inclusions and blemishes visible to the naked eye).


The color of a diamond is graded on a scale from D (colorless) to Z (light yellow or brown). Diamonds with less color are considered more valuable because they allow more light to pass through, resulting in a greater display of brilliance and fire. Colorless diamonds are rare and highly sought after, making them more valuable than diamonds with noticeable color.


The cut of a diamond refers to how well it has been shaped and faceted. A well-cut diamond reflects light internally and externally, creating maximum sparkle and brilliance. The GIA grades diamond cuts on a scale from Excellent to Poor. Diamonds with excellent cuts are more valuable due to their superior light performance.

It’s important to note that while each of these factors contributes to a diamond’s value, the overall worth of a diamond is subjective and can vary depending on personal preferences and market demand. To get an accurate valuation of a diamond, it is recommended to consult with a reputable jeweler or use online resources such as GIA or Blue Nile that provide comprehensive diamond grading information and pricing guides.

How Diamond Grading Affects Price

Diamond grading is a crucial factor that determines the worth of a diamond. It involves the evaluation of a diamond’s characteristics such as cut, color, clarity, and carat weight. The grading process is conducted by reputable gemological laboratories, which provide certifications and documents that authenticate a diamond’s quality and value. Let’s take a closer look at some of the well-known diamond grading systems and their impact on the price of a 20 carat diamond.

GIA Diamond Grading

The Gemological Institute of America (GIA) is one of the most respected and widely recognized diamond grading laboratories in the world. Their grading system is highly regarded for its consistency and impartiality. GIA assigns a grade to each of the Four Cs (cut, color, clarity, and carat weight), creating a comprehensive report that details the diamond’s characteristics. This report, known as a GIA Diamond Grading Report, provides potential buyers with valuable information about the diamond’s quality. Diamonds with higher grades in each category command higher prices, as they are considered more rare and desirable.

The GIA Diamond Grading Report includes an assessment of the diamond’s cut, which is essential for maximizing its brilliance and sparkle. A well-cut diamond reflects light in a way that enhances its beauty, making it more valuable. Additionally, the report evaluates the diamond’s color, ranging from D (colorless) to Z (light yellow or brown). Diamonds with less color are more valuable, as they allow more light to pass through, resulting in greater brilliance.

Furthermore, the report assesses the diamond’s clarity, which refers to the presence of internal or external flaws. The fewer the flaws, the higher the clarity grade and the greater the value. Finally, the carat weight of the diamond is also mentioned in the report, with larger carat weights generally commanding higher prices.

AGS Diamond Quality Document

The American Gem Society (AGS) is another well-respected diamond grading laboratory. Their diamond grading system is similar to GIA’s but with a slight variation in how they assign grades. The AGS Diamond Quality Document provides a comprehensive analysis of a diamond’s characteristics, including the Four Cs. The document also includes a cut grade, which assesses the diamond’s light performance, proportions, and overall craftsmanship. A higher cut grade signifies a more valuable diamond.

Like GIA, AGS assigns color and clarity grades to a diamond, with higher grades indicating more valuable diamonds. The AGS Diamond Quality Document is a valuable tool for buyers, as it provides a detailed analysis of the diamond’s quality and value.

EGL Diamond Certificate

The European Gemological Laboratory (EGL) is a well-known diamond grading laboratory that operates in various locations worldwide. EGL provides diamond certificates that detail the diamond’s characteristics and quality. However, it’s important to note that EGL’s grading standards may not be as stringent as GIA or AGS. This difference in grading can sometimes lead to discrepancies in diamond values when compared to GIA or AGS graded diamonds.

While EGL certificates can still provide useful information, it is advised to be cautious when comparing the value of a diamond graded by EGL to those graded by GIA or AGS. It’s essential to work with a reputable jeweler who can offer guidance and ensure that the diamond’s value aligns with its grading certificate.

Where to Buy a 20 Carat Diamond

When it comes to purchasing a 20 carat diamond, finding the right place to buy it is crucial. Here are some options to consider:

Online Retailers

Online retailers offer a convenient and often wide selection of diamonds, including 20 carat diamonds. Websites like Blue Nile and James Allen are known for their extensive inventory and competitive prices. They provide detailed information about each diamond’s specifications and offer high-quality images for customers to examine before making a purchase. Additionally, online retailers often have customer reviews and ratings, allowing potential buyers to gauge the reputation and reliability of the seller.

Jewelry Stores

Traditional brick-and-mortar jewelry stores are another option for purchasing a 20 carat diamond. These stores often have knowledgeable staff who can guide buyers in selecting the right diamond based on their preferences and budget. Stores like Tiffany & Co. and Harry Winston are renowned for their exceptional craftsmanship and exquisite selection of diamonds. While the prices may be higher compared to online retailers, the advantage of shopping at a jewelry store is the opportunity to see and inspect the diamond in person before making a decision.

Diamond Districts

Diamond districts, such as the one in New York City’s 47th Street, offer a vast array of diamond merchants and wholesalers. These districts are known for their competitive prices and the ability to negotiate directly with sellers. Buyers can browse through numerous diamond options, compare prices, and find the best deal. It is important, however, to exercise caution and ensure the authenticity and quality of the diamond by requesting certification from reputable grading laboratories like the Gemological Institute of America (GIA) or the American Gem Society (AGS).


Auctions can be a thrilling way to acquire a 20 carat diamond at a potentially lower price. Auction houses like Sotheby’s and Christie’s frequently feature rare and valuable diamonds in their sales. These auctions attract serious collectors and investors who are willing to bid substantial amounts for exceptional stones. It’s important to do thorough research and have a budget in mind before participating in a diamond auction. Additionally, buyers should be aware of any additional fees or commissions that may be added to the final price.

Whether purchasing from an online retailer, a jewelry store, a diamond district, or through an auction, it is crucial to do thorough research, compare prices, and ensure that the diamond comes with proper certification. Buying a 20 carat diamond is a significant investment, and finding a reputable seller will help ensure a smooth and satisfactory purchase.

How to Get the Best Price

When it comes to purchasing a 20 carat diamond, getting the best price is crucial. Here are some tips to help you navigate the diamond market and ensure you get the most value for your money.

Comparison Shop

One of the most important steps in getting the best price for a 20 carat diamond is to comparison shop. Don’t settle for the first offer you receive. Take the time to visit multiple jewelry stores and online retailers to see how prices compare. Look for reputable sellers who offer competitive pricing and high-quality diamonds. Remember, the more options you explore, the better chance you have of finding a great deal.


Don’t be afraid to negotiate when purchasing a 20 carat diamond. Many jewelers are willing to negotiate on the price, especially if you are a serious buyer. Start by researching the current market value of 20 carat diamonds, so you have a baseline for negotiation. Be confident and assertive in your negotiations, but also be willing to compromise. Remember, both the buyer and the seller want to reach a mutually beneficial agreement.

Buy Certified Diamonds

When buying a 20 carat diamond, it is essential to choose certified diamonds. Certification is crucial as it ensures the authenticity and quality of the diamond. Look for diamonds that have been certified by reputable gemological laboratories such as the Gemological Institute of America (GIA) or the American Gem Society (AGS). Certified diamonds come with detailed reports that provide information about the diamond’s characteristics, including its cut, color, clarity, and carat weight. This information will help you determine the diamond’s value and ensure you are getting a fair price.

Consider Alternative Center Stones

While a 20 carat diamond is undoubtedly stunning, it may not be the most practical option for everyone. Consider alternative center stones that offer similar beauty and sparkle at a fraction of the cost. For example, moissanite and lab-grown diamonds are becoming increasingly popular due to their affordability and ethical sourcing. These stones can mimic the appearance of a 20 carat diamond without the hefty price tag. Explore different options and choose the stone that best fits your budget and preferences.

By following these tips, you can increase your chances of getting the best price for a 20 carat diamond. Remember to take your time, do your research, and be open to alternatives. With a little effort, you can find a stunning diamond that not only fits your budget but also brings joy for years to come.


A 20 carat high quality diamond is an extremely rare and valuable gemstone. While the costs may be out of reach for many, understanding how these diamonds are valued can still be an intriguing topic for diamond lovers. Factors like carat weight, clarity, color and cut grade all work together to determine the final price. Doing thorough research, finding certified diamonds, and negotiating can help get the best deal possible on these extravagant jewels.

Sharing is caring!

Similar Posts