Diamond Buying Guide: 4Cs Explained

1. Cut (Most Important for Sparkle ✨)

Cut refers to how well a diamond is shaped and how its facets interact with light.

Key Points:

• It is not the shape (round, oval, etc.), but the quality of craftsmanship
• Determines brilliance (white light), fire (rainbow colors), and scintillation (sparkle)

Grades:

• Excellent
• Very Good
• Good
• Fair
• Poor

Why it matters:

Even a diamond with perfect color and clarity will look dull if the cut is poor. A well-cut diamond reflects light internally and shines brightly.

2. Color (How White the Diamond Is)

Color measures the absence of color in a diamond.

Scale:

• D–F: Colorless (highest quality)
• G–J: Near colorless (great value)
• K–M: Slight yellow tint
• N–Z: Noticeable color

Why it matters:

• The less color, the rarer and more expensive the diamond
• Most buyers prefer G–H range for a balance of beauty and price

3. Clarity (Purity of the Diamond)

Clarity refers to internal inclusions and external blemishes formed during natural creation.

Clarity Grades:

• FL (Flawless) – no imperfections under 10x magnification
• IF (Internally Flawless)
• VVS1–VVS2 (Very Very Slight)
• VS1–VS2 (Very Slight)
• SI1–SI2 (Slightly Included)
• I1–I3 (Included)

Why it matters:

• Most inclusions are invisible to the naked eye
• VS or SI grades often look clean but cost less than flawless stones

4. Carat (Weight of the Diamond)

Carat measures the diamond’s weight—not size, though size increases with carat.

Key Facts:

• 1 carat = 200 milligrams
• Larger diamonds are rarer, so price increases sharply with size

Important Tip:

Two diamonds can have the same carat weight but look different in size depending on the cut.