The 4Cs Diamond Guide

Discover the universal standards used to evaluate diamond quality and learn how to choose a diamond with confidence.

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What Are the 4Cs?

The 4Cs — Cut, Color, Clarity and Carat Weight — are internationally recognized characteristics used to evaluate a diamond. Understanding each factor helps you choose the right balance of beauty, quality and value.

Cut

Color

Clarity

Carat

Diamond cut example

1. Cut

Cut determines how effectively a diamond interacts with light. Excellent proportions can create exceptional brightness, fire and scintillation.

Cut Grading Scale
Excellent
Very Good
Good
Fair
Poor
Diamond color example

2. Color

Diamond color grades describe how colorless a diamond appears. Stones closer to colorless are generally rarer, while warmer grades may offer excellent value.

Color Grading Scale
D Colorless
E–F Colorless
G–H Near Colorless
I–J Slight Tint
K–M Warm Tint
N–Z Visible Color
Diamond clarity example

3. Clarity

Clarity evaluates natural internal characteristics known as inclusions and external characteristics known as blemishes. Many are microscopic and difficult to see without magnification.

Clarity Grading Scale
FL Flawless
IF Internally Flawless
VVS1–VVS2 Very Very Slightly Included
VS1–VS2 Very Slightly Included
SI1–SI2 Slightly Included
I1–I3 Included
Diamond carat example

4. Carat

Carat measures diamond weight rather than physical diameter. One carat equals 0.20 grams. Size, proportions and shape all influence how large a diamond appears.

Carat Weight Scale
0.25 Carat
0.50 Carat
0.75 Carat
1.00 Carat
1.50 Carat
2.00 Carat
3.00 Carat

Why the 4Cs Matter

Finding the right diamond is about balancing the four characteristics according to your style, priorities and budget.

Make an Informed
Decision

Get the Best Value
for Your Budget

Ensure Quality and
Authenticity

Find a Diamond You'll
Love for Years

Diamond certification

Certifications You Can Trust

Diamond grading reports provide important information about the characteristics and quality of your diamond. Look for reports issued by established independent gemological laboratories.

  • GIA — Gemological Institute of America
  • IGI — International Gemological Institute
  • Other recognized independent laboratories

Need Expert Help?

Our diamond specialists can help you compare stones, understand certification and choose a diamond that fits your preferences and budget.

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