Pearl grading uses an industry-consensus AAA-AA-A scale (with no global standardization body, unlike GIA for diamonds). Here is what each grade actually means visually and what you should pay.

The four grading axes

Pearl grades evaluate four traits:

• Surface — percentage of the pearl free from blemishes, pits, cracks, or wrinkles
• Luster — how sharply the pearl reflects light (mirror = best)
• Shape — how close to perfectly round (round > near-round > drop > baroque)
• Color uniformity — for matched strands, how consistent the overtone is from end to end

AAA grade specifications

• Surface: 95%+ clean (5% or less of pearl shows minor imperfections)
• Luster: mirror — you can see your reflection clearly in the pearl
• Shape: round to near-round (within 2% deviation from perfect sphere)
• Color uniformity: in strands, all pearls match within strict overtone tolerance
• Approximate harvest yield: ~5% of all cultured pearls reach AAA
• Premium over AA: typically 50-150% higher price

AA grade specifications

• Surface: 85% clean (15% or less shows imperfections)
• Luster: high — clear and bright but not mirror
• Shape: near-round acceptable (within 5% deviation)
• Color uniformity: minor variation acceptable
• Approximate harvest yield: ~30% of cultured pearls

Side-by-side comparison

Trait	AAA	AA
Surface clean	95%+	85%
Luster	Mirror reflection	High but not mirror
Shape	Round to near-round (≤2% deviation)	Near-round (≤5%)
Harvest %	~5%	~30%
Price (12mm South Sea)	$500-1,200	$200-500

How to tell grades apart visually

The luster test: hold the pearl 6 inches from a window. Look for sharpness of reflection. AAA shows a clear, sharp window outline. AA shows a softer outline. A grade pearls show a fuzzy or blurred reflection.

The surface test: rotate the pearl slowly. AAA pearls reveal no obvious imperfections at conversational distance. AA pearls show 1-2 minor surface marks under careful inspection.

Should you always buy AAA?

Not necessarily. Trade-offs:

• For statement single-pearl jewelry (pendants, earring centers, ring centers), AAA is worth the premium because the pearl is the focal point.
• For matched strands, AAA pricing climbs steeply; AA strands offer dramatically more pearl-per-dollar at the cost of slight uniformity variance.
• For loose pearls used in custom designs where setting hides part of the surface, AA is often the smart choice.

What about AAAA grade?

"AAAA" is sometimes used by retailers for the absolute top-tier — surface 99%+ clean, perfect mirror luster, perfect round, identical color matching. It is not universally recognized; some retailers reserve "AAAA" for marketing reasons. Look for specific quality descriptions (not just letter grades) when comparing high-end pearls.

Our grading commitment

Every piece sold by The South Sea Pearl ships with a certificate documenting the grade and the four-axis evaluation. We grade against industry-consensus standards, not inflated retailer scales. Browse loose Tahitian pearls · White South Sea pearls.