Gia Diamond Price Calculator

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GIA Diamond Price Calculator

D (Colorless) E (Colorless) F (Colorless) G (Near Colorless) H (Near Colorless) I (Near Colorless) J (Near Colorless) K (Faint Color) L M N O P Q R S T U V W X Y Z (Light Yellow to Brown)
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)
Excellent Very Good Good Fair Poor
Round Brilliant Princess Emerald Asscher Oval Marquise Pear Heart Cushion

Estimated Diamond Price:

$0.00

Understanding the GIA Diamond Price Calculator

Diamonds are valued based on a combination of factors, commonly known as the 4 Cs: Carat Weight, Color, Clarity, and Cut. The Gemological Institute of America (GIA) is the world's foremost authority on diamonds and establishes the industry's grading standards. This calculator provides an estimated price range for a diamond based on these GIA-recognized parameters and common market pricing trends.

It's important to note that this calculator provides an approximation. Actual diamond prices can vary significantly due to market fluctuations, specific diamond fluorescence, the precision of the cut, and the reputation of the seller. The shape of the diamond also influences its price per carat, with some shapes being more in demand or requiring more rough material to produce.

The 4 Cs and Their Impact:

  • Carat Weight: This is the standard unit of weight for diamonds, where one carat equals 0.2 grams. Generally, larger diamonds are rarer and thus command higher prices per carat. A 2-carat diamond will be significantly more expensive than a 1-carat diamond of the same quality, not just twice as much, but many times more due to the exponential increase in rarity.
  • Color Grade: Diamonds are graded on a scale from D (colorless) to Z (light yellow or brown). The less color a diamond has, the rarer and more valuable it is. The price difference between adjacent color grades can be substantial, especially in the D-J range.
  • Clarity Grade: This refers to the presence of internal inclusions and external blemishes. Diamonds are graded on a scale from IF (Internally Flawless) to I3 (Included 3). The fewer and less visible these imperfections are, the higher the clarity and the more valuable the diamond.
  • Cut Grade: This refers to how well a diamond's facets interact with light. A well-cut diamond will be more brilliant and firey. GIA's cut grading is primarily for round brilliant diamonds and ranges from Excellent to Poor. A higher cut grade significantly enhances a diamond's beauty and value.

How the Calculator Works (Simplified Model):

This calculator uses a simplified model to estimate diamond prices. It assigns base per-carat values for different combinations of color, clarity, and cut, and then adjusts these values based on the carat weight and shape. The pricing logic is an approximation of market trends:

  • A base price per carat is established, influenced by color, clarity, and cut. Higher grades (e.g., D color, IF clarity, Excellent cut) have higher base prices.
  • The total price is calculated by multiplying the carat weight by this adjusted per-carat price.
  • Certain shapes (e.g., Round Brilliant) are often priced at a premium compared to others due to market demand and the nature of cutting.

Disclaimer: This calculator is for educational and estimation purposes only. It does not provide certified appraisals or real-time market data. For precise valuations, consult with a certified gemologist or diamond dealer.

function calculateDiamondPrice() { var caratWeight = parseFloat(document.getElementById("caratWeight").value); var colorGrade = document.getElementById("colorGrade").value; var clarityGrade = document.getElementById("clarityGrade").value; var cutGrade = document.getElementById("cutGrade").value; var shape = document.getElementById("shape").value; var resultValueElement = document.getElementById("result-value"); resultValueElement.textContent = "$0.00"; // Reset to default if (isNaN(caratWeight) || caratWeight <= 0) { alert("Please enter a valid Carat Weight greater than 0."); return; } // — Simplified Pricing Model — // Base price per carat ($/ct) – highly simplified and illustrative // In reality, this is a complex matrix based on market data, rarity, and demand. var basePricePerCarat = 1000; // Starting point for a very basic diamond // Adjustments based on Color Grade (Example: D=1.8, E=1.7, F=1.6, G=1.4, H=1.2, I=1.0, J=0.9, K+=lower) var colorMultiplier = 1.0; switch (colorGrade) { case "D": colorMultiplier = 1.8; break; case "E": colorMultiplier = 1.7; break; case "F": colorMultiplier = 1.6; break; case "G": colorMultiplier = 1.4; break; case "H": colorMultiplier = 1.2; break; case "I": colorMultiplier = 1.0; break; case "J": colorMultiplier = 0.9; break; case "K": colorMultiplier = 0.75; break; case "L": colorMultiplier = 0.6; break; case "M": colorMultiplier = 0.5; break; default: colorMultiplier = 0.4; break; // For N-Z } // Adjustments based on Clarity Grade (Example: IF=1.5, VVS1=1.4, VVS2=1.3, VS1=1.2, VS2=1.1, SI1=1.0, SI2=0.9, I1=0.7, I2=0.5, I3=0.3) var clarityMultiplier = 1.0; switch (clarityGrade) { case "IF": clarityMultiplier = 1.5; break; case "VVS1": clarityMultiplier = 1.4; break; case "VVS2": clarityMultiplier = 1.3; break; case "VS1": clarityMultiplier = 1.2; break; case "VS2": clarityMultiplier = 1.1; break; case "SI1": clarityMultiplier = 1.0; break; case "SI2": clarityMultiplier = 0.9; break; case "I1": clarityMultiplier = 0.7; break; case "I2": clarityMultiplier = 0.5; break; case "I3": clarityMultiplier = 0.3; break; } // Adjustments based on Cut Grade (Example: EX=1.3, VG=1.15, G=1.0, F=0.85, P=0.7) var cutMultiplier = 1.0; switch (cutGrade) { case "EX": cutMultiplier = 1.3; break; case "VG": cutMultiplier = 1.15; break; case "G": cutMultiplier = 1.0; break; case "F": cutMultiplier = 0.85; break; case "P": cutMultiplier = 0.7; break; } // Adjustment for Shape (Example: Round is premium, others might be slightly less) var shapeMultiplier = 1.0; switch (shape) { case "Round": shapeMultiplier = 1.1; break; // Round is often most popular and pricier per carat case "Princess": shapeMultiplier = 1.05; break; case "Emerald": shapeMultiplier = 0.95; break; case "Asscher": shapeMultiplier = 0.93; break; case "Oval": shapeMultiplier = 0.98; break; case "Marquise": shapeMultiplier = 0.97; break; case "Pear": shapeMultiplier = 0.96; break; case "Heart": shapeMultiplier = 0.94; break; case "Cushion": shapeMultiplier = 1.02; break; default: shapeMultiplier = 1.0; } // Calculate effective price per carat var effectivePricePerCarat = basePricePerCarat * colorMultiplier * clarityMultiplier * cutMultiplier * shapeMultiplier; // Calculate total price, considering carat weight's impact on rarity/price per carat // For larger diamonds, the price per carat tends to increase more rapidly than linearly. // This is a very rough approximation. A common model is price = (price_per_carat_at_weight) * carat_weight // and price_per_carat_at_weight is often non-linear. // We'll apply a small exponent to carat weight to simulate this rarity premium. var caratWeightFactor = Math.pow(caratWeight, 1.15); // Simple way to account for non-linear price increase with size var totalPrice = effectivePricePerCarat * caratWeightFactor; // Format the result resultValueElement.textContent = "$" + totalPrice.toLocaleString(undefined, { minimumFractionDigits: 2, maximumFractionDigits: 2 }); }

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