Determining the "rate" of a diamond is a complex process that relies on the globally recognized "4Cs" established by the GIA (Gemological Institute of America). Unlike gold, which has a standard price per gram, diamonds are valued based on their unique combination of characteristics.
Our Diamond Rate Calculator uses a base market algorithm to estimate current retail prices. The primary factors include:
Carat Weight: As carat weight increases, the price per carat jumps exponentially. A 2-carat diamond is significantly more expensive than two 1-carat diamonds of the same quality because larger stones are rarer.
Color Grade: The scale ranges from D (completely colorless) to Z (light yellow or brown). The less color, the higher the rate.
Clarity Grade: This measures the presence of inclusions (internal) and blemishes (external). FL (Flawless) represents the peak of the market.
Cut Quality: Often considered the most important "C," the cut determines the diamond's brilliance and fire. An Excellent cut can command a 40% premium over a Fair cut.
Example Valuation Scenarios
Carat
Color
Clarity
Cut
Est. Total Value
1.00
D
VVS1
Excellent
$11,500 – $13,000
1.00
G
VS2
Very Good
$5,500 – $6,500
0.50
H
SI1
Good
$1,200 – $1,600
Why Do Prices Vary?
The rates provided by this tool are estimates. Actual market prices may vary based on fluorescence, certificate laboratory (GIA, IGI, or EGL), and specific shape (Round, Princess, Pear). Round Brilliant diamonds typically carry the highest price per carat due to high demand and significant wastage of the rough stone during the cutting process.
function calculateDiamondRate() {
var carat = parseFloat(document.getElementById("caratWeight").value);
var colorMultiplier = parseFloat(document.getElementById("diamondColor").value);
var clarityMultiplier = parseFloat(document.getElementById("diamondClarity").value);
var cutMultiplier = parseFloat(document.getElementById("diamondCut").value);
if (isNaN(carat) || carat = 2.0) {
weightPremium = 2.5;
} else if (carat >= 1.5) {
weightPremium = 1.8;
} else if (carat >= 1.0) {
weightPremium = 1.4;
} else if (carat < 0.5) {
weightPremium = 0.7;
}
// Calculate final price per carat
var calculatedRatePerCarat = basePricePerCarat * colorMultiplier * clarityMultiplier * cutMultiplier * weightPremium;
// Calculate total value
var totalValue = calculatedRatePerCarat * carat;
// Display results
var resultBox = document.getElementById("resultBox");
var totalValueDisplay = document.getElementById("totalValue");
var rateDisplay = document.getElementById("perCaratRate");
resultBox.style.display = "block";
totalValueDisplay.innerHTML = "$" + totalValue.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
rateDisplay.innerHTML = "Price per Carat: $" + calculatedRatePerCarat.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
// Scroll to result
resultBox.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
}