Diamond Price Calculator – Formulas And Logic
Diamonds are usually quoted using a price per carat. To find the full cost, you multiply the carat weight by the price per carat. If you are buying or pricing several identical stones, you also multiply by the number of stones. This Diamond Price Calculator automates those steps and lets you apply a discount or markup in a single view.
The goal is to keep the pricing math transparent, so every number on the screen comes from a clear formula you can verify by hand if you want to.
Step 1: Base Price Per Stone
The starting point is the price of one diamond. Let:
- C be the carat weight per stone
- P be the price per carat
The base price of one stone is:
Example: a 1.20 carat diamond at 5,000 per carat has:
The calculator uses exactly this formula for each individual stone.
Step 2: Base Total Price For Multiple Stones
If you are pricing multiple identical stones, introduce N as the number of stones. The base total price is then:
Continuing the example, if you are buying 3 stones at 1.20 carats each with the same price per carat:
The calculator multiplies carat weight per stone by price per carat and by quantity in one step.
Step 3: Applying A Discount
Many diamond deals are quoted as a percentage discount from a reference price list or from the seller’s sticker price. Let D be the discount percentage. The final price with a discount is:
The discount amount in currency terms is the difference between base and final prices:
Example: if the base total price is 18,000 and the discount is 15 percent:
The discount amount is 18,000 − 15,300 = 2,700.
Step 4: Applying A Markup
If you are a retailer or trader setting a selling price, you may add a markup instead of a discount. Let M be the markup percentage. The final price with a markup is:
The markup amount is:
Example: with a base total price of 18,000 and a markup of 20 percent:
The markup amount is 21,600 − 18,000 = 3,600.
Step 5: Effective Price Per Carat
To compare offers it is often useful to look at the effective price per carat after discount or markup has been applied. Let F be the final total price and T be the total carat weight across all stones. Total carats are:
The effective price per carat is:
This lets you see the net per-carat cost after all adjustments, making it easier to compare with other stones or suppliers.
Currency Handling In The Calculator
The Diamond Price Calculator does not lock you into a specific currency. All prices are treated as numbers, and the currency symbol is simply attached to the formatted result. You can enter $, €, £, AED or any other symbol and the formulas remain the same. If you switch currency, you just need to adjust the price per carat input to match.
How To Use The Diamond Price Calculator
- Enter the carat weight per stone (for example 0.75, 1.00 or 2.50).
- Type the price per carat in your chosen currency.
- Set the number of stones you are pricing.
- Choose whether you are applying no adjustment, a discount or a markup.
- Enter the discount or markup percentage if applicable.
- Set the currency symbol and the number of decimal places you want to see.
- Click the calculate button to view base price per stone, base total price, adjustment amount, final total price and effective price per carat.
How This Simple Model Relates To Real-World Diamond Pricing
In real markets, diamond prices depend on carat weight, cut, color, clarity, shape, certification and current supply and demand. Price per carat often rises at key weight thresholds such as 0.50 ct, 1.00 ct, 1.50 ct and 2.00 ct. Wholesalers frequently work with price tables and then apply discounts or markups to those reference values.
This calculator focuses on the core arithmetic once you know the appropriate price per carat for the stone’s grade. It does not replace detailed pricing tables or professional expertise, but it makes it easy to see how changes in carat weight, quantity or discount level affect the total price.
Diamond Price Calculator FAQs
Frequently Asked Questions About Diamond Pricing
Understand how carat weight, price per carat and percentage adjustments combine to determine the final diamond price.
You can use price quotes from trusted jewelers, online listings for comparable diamonds, or wholesale price sheets as a starting point. Make sure you match carat range, cut quality, color, clarity and certification as closely as possible when choosing a price per carat value.
If you keep the price per carat constant, doubling carat weight will double the price. In practice, larger diamonds have higher price per carat, so the per-carat input usually changes with size. The calculator assumes the price per carat you enter already reflects the size and quality of the stone.
Yes. For melee parcels, you can use the average carat weight per stone and a parcel price per carat. Enter those values and the number of stones to estimate the parcel value using the same formulas.
In that case it is more accurate to price each stone separately and then add the results. You can run the calculator multiple times with different carat weights and price per carat values and then sum the final prices manually or in a spreadsheet.
No. Taxes, certification fees, setting costs and other charges are not built into the formulas. You can treat the markup field as a way to approximate these extras if you like, or add them separately after calculating the diamond-only price.