Pearl Grading Systems: AAA-A, Paspaley, Tahitian A-D, and the GIA 7 Value Factors

"AAA" is not a standard. Neither is "AAA+". Pearl grading is one of the few areas of fine gemology where multiple incompatible letter systems coexist in the market, and the same letter can mean different things depending on which producer or auction is using it. This guide explains the four frameworks any serious pearl buyer needs to recognize, where they apply, and how to compare across them without being misled.

What grading actually measures

Whichever system a seller uses, grading is meant to capture the same underlying observable properties. The Gemological Institute of America formalized them as the 7 Pearl Value Factors in its 2021 Gems & Gemology paper:

1. Size — millimeter diameter for round pearls; longest dimension for non-round.
2. Shape — round, near-round, button, drop, oval, semi-baroque, baroque, circle, keshi.
3. Colour — composed of bodycolor, overtone, and orient.
4. Luster — five grades: Excellent, Very Good, Good, Fair, Poor.
5. Surface — proportion of the pearl free of visible blemishes.
6. Nacre quality — Excellent, Very Good, Good, Fair, Poor (GIA expanded scale, effective May 2025).
7. Matching — for pairs and strands, the uniformity across all seven other factors.

CIBJO's Pearl Book 2024 uses the same set of observable factors but does not mandate a universal letter scale. That is critical: there is no internationally certified A, AA, or AAA grade. Every letter grade you see is producer-defined, retailer-defined, or auction-defined.

System 1 — The AAA-A producer convention (white South Sea, Akoya, freshwater)

The most common producer scale outside French Polynesia is the AAA-A scale (sometimes extended to AAAA at the very top by individual retailers). South Sea Pearl Australia, the main producer association, publishes the following definitions:

Note three things. First, even AAA allows about 5% surface imperfection by area — no cultured pearl is truly flawless, and any seller claiming "100% blemish-free" is using marketing language, not technical language. Second, this scale rolls multiple factors (surface and luster, sometimes with shape and matching folded in) into one letter, so "AAA" on a strand means more than "AAA" on a single pearl. Third, because the scale is producer-defined, AAA from one farm is not exactly AAA from another — small calibration differences exist.

System 2 — Paspaley's proprietary grading

Paspaley, the largest single producer of Australian South Sea pearls, publishes its own internal scale at the wholesale level: Statement, Fine, Fashion, Foundation, applied across what Paspaley calls the "Five Virtues" (lustre, complexion, shape, colour, size). The four tiers are not a one-to-one map to AAA-A, and Paspaley uses its system principally for trade transactions; retail strands sourced from Paspaley auction lots usually translate into the AAA-A system at the retailer's discretion.

If a retailer cites "Paspaley grade Statement", that is a defensible specific claim. "Paspaley grade AAA" is not — Paspaley does not issue AAA grades.

System 3 — Tahitian A-D (don't mix with AAA)

French Polynesian Tahitian producers use a four-letter scale at origin, with A as the best and D as the lowest. The scale focuses on surface defects and luster; the bands are roughly:

• A — surface defects on at most ~10% of the pearl's area, high luster
• B — defects on up to ~30%, medium-high luster
• C — defects on up to ~60%, medium luster
• D — heavy defects, low luster (commonly used for craft or bulk lots)

When Tahitian pearls move from origin to Hong Kong or other auction venues, the A-D grades are commonly translated into the AAA-A system. Here is where buyers are misled most often: Tahitian "A" and AAA-system "A" are not the same. Tahitian "A" is the top grade. AAA-system "A" is the bottom jewelry grade. A retailer who lists a Tahitian strand as "Grade A" without specifying which system is using a technically ambiguous label that favours the higher-sounding interpretation. Always ask which system is being referenced.

System 4 — The GIA Cultured Pearl Classification Report

For the highest-end pieces, GIA issues a Cultured Pearl Classification Report that applies the 7 Value Factors individually. This is not a letter grade. Instead, each factor is rated on its own scale — for example, luster as Excellent / Very Good / Good / Fair / Poor — and the report lists them side by side. As of May 2025, nacre quality uses the same five-step scale.

A piece sold with a GIA report is the gold standard for verification, particularly for high-value individual pearls (large South Sea drops, important Tahitian rounds, antique natural pearls). GIA does not issue overall "AAA" letter grades on these reports — the misuse of "GIA AAA" by some retailers is a red flag.

How to read a grading claim without being misled

Five practical rules:

1. Ask which system. If a retailer cannot tell you whether their "Grade A" is Tahitian A-D or AAA-A producer convention, the grading was applied loosely.
2. Look for the components. A grade of "AAA" without component breakdown (luster, surface, nacre) is a summary, not a specification. Reputable retailers list luster and surface separately.
3. Beware of "AAAA" or "AAA+". These are retail extensions to the producer scale, not standardized. They may be defensible (a retailer using internal sub-grading) or not.
4. Don't expect 100% clean. Even at AAA on the producer scale, ~5% surface area can show fine imperfections. CIBJO and producer associations agree on this.
5. Reject "investment grade". This is not a recognized technical term in any of the four systems above. It carries legal risk under US FTC rules and means nothing precise. If you want a piece that holds value, ask for documentation of size, species, colour-treatment status, and source — those carry transferable value.

For deeper detail on individual factors (size ranges, colour terminology, surface scoring), see our dedicated pearl grading guide and the pearl types comparison for how grading interacts with species.

Where our pearls sit

Pearls offered at The South Sea Pearl are graded in the AAA-A producer convention at sourcing, with each pearl's individual luster and surface notes available in the product description. For any strand of large South Sea or Tahitian pearls, ask about GIA reports — we recommend independent verification for any piece above a meaningful price threshold. Browse the South Sea pearls collection for examples with the full grading breakdown.