Diamond Pricing Calculator

Diamond Price Estimator

Use this calculator to get an estimated price for a loose diamond based on its key characteristics (the 4 Cs and Shape). Please note that this is an estimation tool, and actual market prices can vary significantly due to many factors including market demand, specific vendor pricing, fluorescence, polish, symmetry, and certification.

Enter the diamond's weight in carats (e.g., 1.0 for a one-carat diamond).

Round Princess Emerald Oval Pear Marquise Asscher Radiant Cushion Heart

The shape significantly impacts price, with Round typically being the most expensive.

Excellent Very Good Good Fair

Cut refers to how well a diamond's facets interact with light. Excellent cut diamonds are the most brilliant.

D (Colorless) E F G (Near Colorless) H I J K (Faint Yellow) L M

Color is graded from D (colorless) to Z (light yellow/brown). D-F are considered colorless.

FL (Flawless) IF (Internally Flawless) VVS1 (Very Very Slightly Included 1) VVS2 (Very Very Slightly Included 2) VS1 (Very Slightly Included 1) VS2 (Very Slightly Included 2) SI1 (Slightly Included 1) SI2 (Slightly Included 2) I1 (Included 1) I2 (Included 2) I3 (Included 3)

Clarity refers to the absence of inclusions (internal flaws) and blemishes (external flaws).

function calculateDiamondPrice() { var caratWeight = parseFloat(document.getElementById('caratWeight').value); var diamondShape = document.getElementById('diamondShape').value; var cutGrade = document.getElementById('cutGrade').value; var colorGrade = document.getElementById('colorGrade').value; var clarityGrade = document.getElementById('clarityGrade').value; if (isNaN(caratWeight) || caratWeight <= 0) { document.getElementById('estimatedPriceResult').innerText = 'Please enter a valid carat weight.'; return; } // Base price per carat for a "standard" diamond (e.g., G color, VS2 clarity, Very Good cut, Round shape) // This lookup table defines the base price PER CARAT for a diamond of that specific weight, // assuming G color, VS2 clarity, Very Good cut, and Round shape. var pricePerCaratBaseValues = { 0.25: 2000, // Price per carat for a 0.25ct G/VS2/VG/Round 0.5: 3500, // Price per carat for a 0.5ct G/VS2/VG/Round 0.75: 5000, // Price per carat for a 0.75ct G/VS2/VG/Round 1.0: 7000, // Price per carat for a 1.0ct G/VS2/VG/Round 1.5: 9000, // Price per carat for a 1.5ct G/VS2/VG/Round 2.0: 11000, // Price per carat for a 2.0ct G/VS2/VG/Round 3.0: 14000, // Price per carat for a 3.0ct G/VS2/VG/Round 4.0: 17000, // Price per carat for a 4.0ct G/VS2/VG/Round 5.0: 20000 // Price per carat for a 5.0ct G/VS2/VG/Round }; var basePricePerCarat = 0; var caratKeys = Object.keys(pricePerCaratBaseValues).map(Number).sort(function(a, b){return a-b}); // Find the appropriate base price per carat based on the input carat weight if (caratWeight = caratKeys[caratKeys.length – 1]) { // If greater than or equal to the largest key basePricePerCarat = pricePerCaratBaseValues[caratKeys[caratKeys.length – 1]]; } else { for (var i = 0; i = caratKeys[i] && caratWeight < caratKeys[i+1]) { // Linear interpolation between two points var lowerCarat = caratKeys[i]; var upperCarat = caratKeys[i+1]; var lowerPrice = pricePerCaratBaseValues[lowerCarat]; var upperPrice = pricePerCaratBaseValues[upperCarat]; basePricePerCarat = lowerPrice + ((upperPrice – lowerPrice) / (upperCarat – lowerCarat)) * (caratWeight – lowerCarat); break; } } } // Multipliers for Cut Grade var cutMultipliers = { 'Excellent': 1.15, 'Very Good': 1.0, 'Good': 0.85, 'Fair': 0.7 }; var cutMultiplier = cutMultipliers[cutGrade] || 1.0; // Default to 1.0 if not found // Multipliers for Color Grade var colorMultipliers = { 'D': 1.3, 'E': 1.2, 'F': 1.1, 'G': 1.0, 'H': 0.9, 'I': 0.8, 'J': 0.7, 'K': 0.6, 'L': 0.5, 'M': 0.4 }; var colorMultiplier = colorMultipliers[colorGrade] || 1.0; // Multipliers for Clarity Grade var clarityMultipliers = { 'FL': 1.5, 'IF': 1.4, 'VVS1': 1.3, 'VVS2': 1.2, 'VS1': 1.1, 'VS2': 1.0, 'SI1': 0.9, 'SI2': 0.8, 'I1': 0.6, 'I2': 0.5, 'I3': 0.4 }; var clarityMultiplier = clarityMultipliers[clarityGrade] || 1.0; // Multipliers for Shape var shapeMultipliers = { 'Round': 1.0, 'Princess': 0.85, 'Emerald': 0.8, 'Oval': 0.9, 'Pear': 0.88, 'Marquise': 0.82, 'Asscher': 0.83, 'Radiant': 0.87, 'Cushion': 0.89, 'Heart': 0.85 }; var shapeMultiplier = shapeMultipliers[diamondShape] || 1.0; // Calculate total estimated price // The basePricePerCarat is already adjusted for the carat weight range. // So, total price = (basePricePerCarat * caratWeight) * cut * color * clarity * shape var estimatedPrice = (basePricePerCarat * caratWeight) * cutMultiplier * colorMultiplier * clarityMultiplier * shapeMultiplier; document.getElementById('estimatedPriceResult').innerText = '$' + estimatedPrice.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ","); } .diamond-pricing-calculator { font-family: Arial, sans-serif; max-width: 700px; margin: 20px auto; padding: 25px; border: 1px solid #ddd; border-radius: 8px; background-color: #f9f9f9; box-shadow: 0 2px 5px rgba(0,0,0,0.1); } .diamond-pricing-calculator h2 { text-align: center; color: #333; margin-bottom: 20px; } .diamond-pricing-calculator label { display: block; margin-bottom: 8px; font-weight: bold; color: #555; } .diamond-pricing-calculator input[type="number"], .diamond-pricing-calculator select { width: calc(100% – 22px); padding: 10px; margin-bottom: 10px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box; font-size: 1em; } .diamond-pricing-calculator .input-description { font-size: 0.85em; color: #777; margin-top: -5px; margin-bottom: 15px; } .diamond-pricing-calculator button { background-color: #007bff; color: white; padding: 12px 20px; border: none; border-radius: 4px; cursor: pointer; font-size: 1.1em; width: 100%; margin-top: 20px; transition: background-color 0.3s ease; } .diamond-pricing-calculator button:hover { background-color: #0056b3; } .calculator-result { margin-top: 30px; padding: 15px; border-top: 1px solid #eee; text-align: center; } .calculator-result h3 { color: #333; margin-bottom: 10px; } #estimatedPriceResult { color: #28a745; font-size: 2em; font-weight: bold; }

Understanding Diamond Pricing: The 4 Cs and Beyond

Buying a diamond is a significant investment, and understanding what influences its price is crucial. While the market can be complex, the price of a diamond is primarily determined by a combination of factors known as the "4 Cs": Carat, Cut, Color, and Clarity, along with its Shape.

Carat Weight

Carat refers to a diamond's weight, not its size. One carat equals 200 milligrams. Generally, the higher the carat weight, the more expensive the diamond. However, the price per carat doesn't increase linearly; it often jumps significantly at certain "magic numbers" like 0.5, 1.0, 1.5, and 2.0 carats. This is because larger diamonds are rarer.

For example, a 1.0-carat diamond will cost more than two 0.5-carat diamonds of similar quality, and its price per carat will be higher.

Cut Grade

Often considered the most important of the 4 Cs, the cut grade refers to how well a diamond's facets interact with light. It's not about the diamond's shape, but rather its proportions, symmetry, and polish. An excellent cut maximizes a diamond's brilliance, fire, and scintillation. A poorly cut diamond, even with high color and clarity, will appear dull.

• Excellent: Reflects nearly all light, producing exceptional brilliance and fire.
• Very Good: Reflects most light, offering very good brilliance.
• Good: Reflects a good amount of light, but not as brilliant as higher grades.
• Fair: Reflects some light, but brilliance is noticeably compromised.

Color Grade

Diamond color is graded on a scale from D to Z, with D being completely colorless and Z having a noticeable light yellow or brown tint. The less color a diamond has, the rarer and more valuable it is. Most diamonds used in jewelry fall into the "near colorless" range (G-J), which appear colorless to the untrained eye, especially when mounted.

• D-F: Colorless. The highest grades, very rare and expensive.
• G-J: Near Colorless. Appear colorless face-up, especially when set. Excellent value.
• K-M: Faint Yellow. A slight yellow tint is visible.
• N-Z: Very Light to Light Yellow. Noticeable yellow tint.

Clarity Grade

Clarity refers to the absence of inclusions (internal flaws) and blemishes (external flaws). Most diamonds have some imperfections, but many are not visible to the naked eye. Clarity is graded under 10x magnification.

• FL (Flawless): No inclusions or blemishes visible under 10x magnification. Extremely rare.
• IF (Internally Flawless): No inclusions visible under 10x magnification, only minor blemishes.
• VVS1, VVS2 (Very Very Slightly Included): Inclusions are extremely difficult to see under 10x magnification.
• VS1, VS2 (Very Slightly Included): Inclusions are difficult to see under 10x magnification. Excellent value.
• SI1, SI2 (Slightly Included): Inclusions are noticeable under 10x magnification, and may be visible to the naked eye in SI2.
• I1, I2, I3 (Included): Inclusions are obvious under 10x magnification and typically visible to the naked eye, potentially affecting transparency and brilliance.

Diamond Shape

While not one of the "4 Cs," the diamond's shape significantly influences its price. Round brilliant diamonds are the most popular and, consequently, the most expensive due to higher demand and the amount of rough diamond lost during cutting to achieve their ideal proportions. Fancy shapes (non-round) like Princess, Emerald, Oval, Pear, etc., can offer a larger look for the same carat weight and are generally less expensive per carat than round diamonds of comparable quality.

How Our Calculator Works (and its Limitations)

Our Diamond Price Estimator uses a simplified model based on typical market trends and the relative impact of each of the 4 Cs and shape. It assigns base prices per carat for various weight ranges and then applies multipliers for different grades of cut, color, clarity, and for different shapes. This provides a general estimate.

Important Considerations:

• Market Fluctuations: Diamond prices are subject to global market demand, economic conditions, and currency exchange rates.
• Certification: Diamonds certified by reputable labs like GIA (Gemological Institute of America) or AGS (American Gem Society) often command higher prices due to their objective grading.
• Fluorescence: Some diamonds exhibit fluorescence under UV light, which can slightly impact price (positively or negatively depending on intensity and appearance).
• Vendor Specifics: Different retailers have different pricing structures, overheads, and profit margins.
• Other Factors: Polish, symmetry, girdle thickness, and culet size also play minor roles.

This calculator is a helpful starting point for understanding potential costs, but for an exact price, always consult with a reputable jeweler and review a diamond's specific grading report.

Example Calculations:

Let's look at a few examples using the calculator's logic:

1. A Standard 1.0 Carat Round Diamond:
   • Carat Weight: 1.0
   • Shape: Round
   • Cut: Very Good
   • Color: G
   • Clarity: VS2
   • Estimated Price: Around $7,000.00 (This is the base for 1.0ct, G, VS2, VG, Round)
2. A High-Quality 1.0 Carat Round Diamond:
   • Carat Weight: 1.0
   • Shape: Round
   • Cut: Excellent
   • Color: E
   • Clarity: VVS1
   • Estimated Price: (7000 * 1.0) * 1.15 (Cut) * 1.2 (Color) * 1.3 (Clarity) * 1.0 (Shape) = $12,558.00
3. A Larger, Good Value 2.0 Carat Oval Diamond:
   • Carat Weight: 2.0
   • Shape: Oval
   • Cut: Good
   • Color: I
   • Clarity: SI1
   • Estimated Price: (11000 * 2.0) * 0.85 (Cut) * 0.8 (Color) * 0.9 (Clarity) * 0.9 (Shape) = $12,117.60

These examples demonstrate how each factor influences the final estimated price. Experiment with different combinations to see the impact of each "C" and shape on a diamond's value.