3.00 ct Round Brilliant Diamond

What reads well

• The GIA Excellent cut grade corroborates the measured proportions.
• Excellent polish and symmetry, the top finish grades.
• Strong blue fluorescence can make I color face up a touch whiter in daylight.
• Medium to slightly thick girdle balances durability and weight retention.

What deserves a closer look

• Crown 34.5° / pavilion 41.8° fall outside the pairing zone associated with strong light return.
• Clouds are referenced on the report; confirm the stone looks transparent rather than hazy.
• Confirm this SI1 round brilliant is eye-clean from an image or video; the report plot shows where inclusions sit.
• Surface-reaching characteristics are listed (knot); check their position on the plot for durability.
• Feathers are listed: check the plot for any that reach the girdle or surface, which matters for durability.

The reading, field by field

Table · Ideal

At 58%, the table sits within the typical 53–59% range for a round brilliant, balancing brightness with fire.

Total depth · Ideal

62.8% is within the typical 59.5–63% range for a round brilliant, keeping weight where it contributes to face-up size and light return.

Crown angle · Ideal

34.5° sits in the 32–36° zone where crown angles typically balance fire and brightness.

Pavilion angle · Closer look

41.8° is steeper than the narrow 40.5–41.3° zone. Deep pavilions can leak light through the sides and darken the center.

Polish · Ideal

Excellent polish is the top finish grade — facets are cleanly executed with nothing that would soften sparkle.

Symmetry · Ideal

Excellent symmetry is the top finish grade — facets are cleanly executed with nothing that would soften sparkle.

Girdle · Ideal

Medium to slightly thick, faceted, 4.0%: a durable girdle thickness that doesn't hide meaningful weight.

Culet · Ideal

None: no visible culet facet when viewed face-up.

Color · Favorable

I may show slight warmth, especially next to white metal. Yellow or rose gold tends to complement it.

Clarity · Favorable

SI1 is often eye-clean in a round brilliant, but not always — check where the inclusions sit.

Fluorescence · Favorable

Strong Blue fluorescence can make an I stone look whiter in daylight; it is rarely a problem at this color.

Cut grade · Ideal

Excellent as issued by GIA, on GIA's own scale. The measured proportions above tell you more than the label.

What to check on the exact stone

• Does the center turn dark or lose sparkle when you tilt the diamond face-up?
• Does the diamond look crisp and transparent in natural light, or is there any milky haze?
• Does the feather reach the outer edge where a setting prong could put pressure on it?
• Can you show me the inscribed report number under a loupe before it is set?

Report facts

Origin

Natural

Carat

3.00 ct

Shape

Round Brilliant

Cut grade

Excellent (GIA)

Color

I

Clarity

SI1

Measurements

9.16–9.20 × 5.76 mm

Table

58%

Total depth

62.8%

Crown angle

34.5°

Pavilion angle

41.8°

Polish

Excellent

Symmetry

Excellent

Girdle

Medium to slightly thick, faceted, 4.0%

Culet

None

Fluorescence

Strong Blue