1.50 ct Round Brilliant Diamond

What reads well

• D color is in the colorless range.

What deserves a closer look

• SI2 is often not eye-clean in a round brilliant; view an image or video of this exact stone.
• The GIA cut grade is Good: the lab's own assessment points to less brightness and fire than its top tier.
• Crown 39° / pavilion 42.4° fall outside the pairing zone associated with strong light return.
• Table 64% and depth 66.6% sit outside the preferred round range.
• Slightly thick to very thick girdle: a thick girdle carries hidden weight and can reduce face-up size.

The reading, field by field

Table · Closer look

A 64% table is larger than typical for a round brilliant (53–59%). Large tables can read bright but flatter, with less fire and contrast.

Total depth · Closer look

66.6% is deeper than typical for a round brilliant (59.5–63%). Extra depth holds weight below the girdle, so the stone can face up smaller than its carat weight suggests.

Crown angle · Closer look

A 39° crown is steeper than the typical 32–36° zone. Steep crowns can add fire, but only pair well with a slightly shallower pavilion.

Pavilion angle · Closer look

42.4° 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 · Favorable

Very Good symmetry is a fine result; the difference from Excellent is rarely visible without magnification.

Girdle · Closer look

Slightly thick to very thick, faceted, 6.5%: a thick girdle carries weight in the rim, so the stone can face up a little smaller for its carat weight. It is durable, though.

Culet · Ideal

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

Color · Ideal

D is in the colorless range and faces up white in any metal.

Clarity · Closer look

SI2: inclusions may be visible to the eye. Confirm with images or video before buying.

Fluorescence · Favorable

Medium Blue fluorescence is rarely visible in normal lighting.

Cut grade · Closer look

Good 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?
• With 66.6% depth, does this stone face up smaller than a typical 1.50 ct round?
• Does the large table look bright but flat, with less colored fire than you expected?
• Can you show me the inscribed report number under a loupe before it is set?

Report facts

Origin

Natural

Carat

1.50 ct

Shape

Round Brilliant

Cut grade

Good (GIA)

Color

D

Clarity

SI2

Measurements

6.96–7.04 × 4.67 mm

Table

64%

Total depth

66.6%

Crown angle

39°

Pavilion angle

42.4°

Polish

Excellent

Symmetry

Very Good

Girdle

Slightly thick to very thick, faceted, 6.5%

Culet

None

Fluorescence

Medium Blue