.diamond-calculator-container {
max-width: 800px;
margin: 0 auto;
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
padding: 20px;
background: #f9f9f9;
border: 1px solid #e0e0e0;
border-radius: 8px;
}
.diamond-calc-header {
text-align: center;
margin-bottom: 25px;
color: #333;
}
.diamond-calc-row {
display: flex;
flex-wrap: wrap;
gap: 20px;
margin-bottom: 15px;
}
.diamond-calc-col {
flex: 1;
min-width: 200px;
}
.diamond-label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #444;
font-size: 0.9em;
}
.diamond-input {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
}
.diamond-input:focus {
border-color: #0073aa;
outline: none;
box-shadow: 0 0 5px rgba(0,115,170,0.2);
}
.calc-btn-wrapper {
text-align: center;
margin-top: 20px;
}
.diamond-btn {
background-color: #333;
color: white;
padding: 12px 30px;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
transition: background-color 0.3s;
}
.diamond-btn:hover {
background-color: #555;
}
.diamond-result-box {
margin-top: 30px;
background: white;
padding: 20px;
border-radius: 6px;
border-left: 5px solid #333;
box-shadow: 0 2px 5px rgba(0,0,0,0.05);
display: none;
}
.result-row {
display: flex;
justify-content: space-between;
padding: 10px 0;
border-bottom: 1px solid #eee;
}
.result-row:last-child {
border-bottom: none;
font-weight: bold;
font-size: 1.2em;
color: #0073aa;
}
.result-label {
color: #666;
}
.article-section {
max-width: 800px;
margin: 40px auto 0;
font-family: inherit;
line-height: 1.6;
color: #333;
}
.article-section h2 {
color: #2c3e50;
border-bottom: 2px solid #eee;
padding-bottom: 10px;
margin-top: 30px;
}
.article-section h3 {
color: #34495e;
margin-top: 20px;
}
.article-section p {
margin-bottom: 15px;
}
.article-section ul {
margin-bottom: 15px;
padding-left: 20px;
}
.highlight-box {
background-color: #f0f7fb;
border: 1px solid #cce5ff;
padding: 15px;
border-radius: 5px;
margin: 20px 0;
}
function calculateDiamondRate() {
// Get Input Elements
var caratInput = document.getElementById('caratWeight');
var rateInput = document.getElementById('ratePerCarat');
var discountInput = document.getElementById('discountPercent');
var taxInput = document.getElementById('taxPercent');
var makingInput = document.getElementById('makingCharges');
// Parse Values
var carat = parseFloat(caratInput.value);
var rate = parseFloat(rateInput.value);
var discountPct = parseFloat(discountInput.value) || 0;
var taxPct = parseFloat(taxInput.value) || 0;
var making = parseFloat(makingInput.value) || 0;
// Validation
if (isNaN(carat) || carat <= 0) {
alert("Please enter a valid Carat Weight.");
return;
}
if (isNaN(rate) || rate < 0) {
alert("Please enter a valid Rate per Carat.");
return;
}
// Calculation Logic
// 1. Base Value = Carat Weight * Rate Per Carat
var baseValue = carat * rate;
// 2. Calculate Discount Amount
var discountAmount = baseValue * (discountPct / 100);
// 3. Price After Discount
var afterDiscount = baseValue – discountAmount;
// 4. Calculate Tax Amount (usually on the price after discount)
var taxAmount = afterDiscount * (taxPct / 100);
// 5. Total Price
var total = afterDiscount + taxAmount + making;
// Display Results
document.getElementById('baseValueDisplay').innerText = baseValue.toFixed(2);
document.getElementById('discountDisplay').innerText = "-" + discountAmount.toFixed(2);
document.getElementById('taxDisplay').innerText = "+" + taxAmount.toFixed(2);
document.getElementById('makingDisplay').innerText = "+" + making.toFixed(2);
document.getElementById('totalDisplay').innerText = total.toFixed(2);
// Show result box
document.getElementById('resultBox').style.display = 'block';
}
How Is Diamond Rate Calculated?
Calculating the price of a diamond is significantly different from pricing standard commodities like gold or silver. While gold has a standard weight-based price that fluctuates daily, diamonds are valued based on a complex matrix of attributes known collectively as the 4Cs: Carat, Cut, Color, and Clarity.
The Core Formula
At its simplest level, the price of a loose diamond is calculated using the following formula:
Total Price = Carat Weight × Rate Per Carat
However, the "Rate Per Carat" is not fixed. It changes drastically depending on the quality of the stone. For example, a 1.00-carat diamond with flawless clarity and colorless grade will have a much higher rate per carat than a 1.00-carat diamond with visible inclusions and a yellow tint.
Factors Influencing the Rate Per Carat
To accurately determine the rate input for the calculator above, one must understand the attributes that define value:
1. Carat Weight (The Multiplier)
Diamond prices increase exponentially, not linearly, with weight. A 2.0-carat diamond is not simply twice the price of a 1.0-carat diamond; it is often three or four times the price. This is because larger stones are rarer. The price jumps often occur at "magic numbers" like 0.50ct, 1.00ct, and 1.50ct.
2. Cut (The Sparkle)
The cut quality (Excellent, Very Good, Good, Fair, Poor) affects the rate significantly. An "Excellent" cut reflects light better, creating more brilliance, and therefore commands a premium rate per carat.
3. Color (The Tint)
Diamonds are graded from D (Colorless) to Z (Light Color).
- D-F: Colorless (Highest Rate)
- G-J: Near Colorless (Mid Rate)
- K-M: Faint Color (Lower Rate)
4. Clarity (The Purity)
Clarity refers to the absence of inclusions (internal flaws) and blemishes (external flaws). Grades range from FL (Flawless) to I3 (Included). Clean stones (VS2 and above) generally see higher rates.
Additional Costs to Consider
When calculating the final price at a jewelry store, several other factors come into play beyond the raw stone cost:
- Discounts: Dealers often quote prices based on the Rapaport Price List and then offer a discount (or "back") percentage based on market liquidity.
- Making Charges: If the diamond is set in jewelry (rings, earrings), there is a labor cost associated with the setting.
- Taxes: VAT, GST, or Sales Tax is applied to the final transaction amount.
- Certification Fees: Graded stones (GIA, IGI, AGS) may carry a premium due to the cost of certification and the assurance of quality they provide.
Example Calculation
Let's assume you are buying a 0.50-carat solitaire ring:
- Carat Weight: 0.50 ct
- Rate Per Carat: 4,000 (Currency Units)
- Base Price: 0.50 × 4,000 = 2,000
- Discount: 10% (200) → Price becomes 1,800
- Tax: 5% on 1,800 (90)
- Total Pay: 1,890
Use the calculator above to experiment with different weights and rates to see how these variables affect your final investment.