Diamond Carat Price Calculator

Work out diamond carat price instantly with clear inputs, formula shown and shareable results.

About Diamond Carat Price Calculator

Price is carat weight times a per-carat rate adjusted by a quality premium; a carat is exactly 200 milligrams, or 100 points. Per-carat prices jump at round weights, so a 0.99 carat stone can cost noticeably less than a 1.01 carat one of identical quality.

Formulas

Price

total = carats x base price per carat x (1 + quality premium)

Weight conversion

1 carat = 200 mg = 100 points

Worked example

With the default values below, Diamond Carat Price Calculator returns Estimated price of $8,580.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Carat weightminimum 0.001 ct: 1.2 ct
Base price per caratminimum 0.01: 6,500
Cut, colour and clarity premiumaccepts -80–200 %: 10 %

Results

Estimated price: $8,580.00
Effective price per carat: $7,150.00
Weight in points: 120.0
Weight in milligrams: 240.0 mg

Step by step

1Values used
2Price
3Weight conversion
4Estimated price= 8,580.00
5Effective price per carat= 7,150.00
6Weight in points= 120.0
7Weight in milligrams= 240.0 mg

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Diamond Carat Price figure worked out?

total = carats x base price per carat x (1 + quality premium). Price is carat weight times a per-carat rate adjusted by a quality premium; a carat is exactly 200 milligrams, or 100 points.

Why does this matter?

Per-carat prices jump at round weights, so a 0.99 carat stone can cost noticeably less than a 1.01 carat one of identical quality.

What do I need to enter?

Enter carat weight, base price per carat, cut, colour and clarity premium. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.