The AA grade is a mid-tier designation within the A–AAA pearl-grading scale formalised by the Cultured Pearl Association of America (CPAA), applied to cultured pearls that exhibit good lustre, acceptable surface cleanliness, and shapes ranging from near-round to slightly off-round. Sitting between the entry-level A grade and the premium AAA designation, AA-grade pearls represent the most commercially prevalent tier in everyday jewellery — a category broad enough to encompass a wide range of Akoya, freshwater, Tahitian, and South Sea cultured pearls that fall short of gem-quality perfection yet remain visually appealing and durable in wear.

The CPAA Grading Framework

The Cultured Pearl Association of America developed its A–AAA grading scale to provide the North American retail trade with a common vocabulary for communicating pearl quality to consumers. The scale comprises three principal grades — A, AA, and AAA — occasionally extended to AA+ as an intermediate step between AA and AAA by some vendors, though AA+ carries no standardised definition within the CPAA's published criteria.

Within this framework, the grades are assessed across four primary quality factors:

• Lustre — the intensity and sharpness of light reflected from the nacre surface and refracted from within.
• Surface quality — the proportion of the pearl's surface affected by blemishes such as pits, scratches, bumps, or nacre irregularities.
• Shape — the degree to which the pearl approximates a perfect sphere, or conforms to its intended baroque or drop form.
• Nacre thickness — particularly relevant for Akoya cultured pearls, where thin nacre can compromise both durability and optical depth.

Defining Characteristics of AA Grade

A pearl graded AA under CPAA criteria typically presents the following characteristics:

• Lustre: Good to very good — reflections are bright and reasonably sharp, though not the mirror-like, high-contrast reflections associated with AAA specimens. Some diffusion at the edges of reflected images may be apparent.
• Surface quality: Minor blemishes are present but confined to less than one-third (approximately 33 per cent) of the pearl's surface. Blemishes are generally light in character — shallow pits, faint scratches, or minor surface irregularities — rather than deep abrasions or pronounced bumps.
• Shape: Near-round to slightly off-round. The pearl may deviate subtly from a perfect sphere when rotated, but the deviation is not immediately obvious to the casual observer when the pearl is set or strung.
• Nacre thickness: Adequate for durability; in Akoya pearls this generally implies a nacre layer sufficient to preclude the chalky or blinking appearance associated with very thin nacre.

In practice, AA-grade pearls are the dominant quality tier found in mid-market retail strands, stud earrings, and pendant settings. Their minor imperfections are frequently concealed by drill holes in strung pieces, or positioned toward the setting in mounted jewellery, making the visible surface appear cleaner than the overall grade might suggest.

Comparison with Adjacent Grades

Understanding AA grade is most useful in relation to its neighbours on the scale. A-grade pearls permit blemishes across up to 60 per cent of the surface and may exhibit noticeably lower lustre or more pronounced shape irregularities; they are generally considered commercial or promotional quality. AAA-grade pearls, by contrast, are held to a considerably stricter standard: blemishes must be confined to less than ten per cent of the surface, lustre must be excellent to exceptional, and shape must be very round to round. AAA pearls represent a small fraction of any harvest and command a corresponding premium.

The AA+ designation, used informally by some retailers and wholesalers, typically describes pearls that meet AA surface and shape criteria but exhibit lustre approaching AAA quality, or conversely, pearls with AAA-level surface cleanliness but slightly imperfect shape. Because AA+ is not a CPAA-defined category, buyers should request explicit clarification of the criteria being applied when this designation appears.

Limitations and Industry Inconsistency

The most significant caveat surrounding the AA grade — and indeed the entire A–AAA scale — is the absence of universal standardisation across the pearl trade. The CPAA scale is a voluntary industry framework, not a regulated or legally binding classification. Individual vendors, importers, and retailers may apply the AA designation according to their own interpretations, which can vary considerably. A strand marketed as AA by one supplier may correspond to what another would grade A+ or AA+.

This inconsistency is compounded by the fact that no single independent gemmological laboratory has established a universally adopted pearl-grading standard equivalent to, for example, the GIA's 4Cs framework for diamonds. The GIA does publish pearl grading criteria and offers pearl grading reports, and its seven grading factors — size, shape, colour, lustre, surface quality, nacre quality, and matching — provide a more granular framework than the A–AAA scale, but GIA-graded pearl reports remain less common in the retail trade than diamond grading reports.

Buyers seeking reliable quality assurance for significant pearl purchases are therefore advised to request grading reports from reputable laboratories, examine pearls under consistent lighting conditions, and where possible, compare specimens side by side rather than relying solely on grade designations.

Market Context

AA-grade cultured pearls occupy the largest segment of the consumer pearl market by volume. In Akoya cultured pearls — the classic round white pearl most associated with Japanese production, principally from Mie Prefecture and the Ago Bay region — AA-grade strands in the 7–7.5 mm size range represent a standard entry point for quality gift jewellery. In Chinese freshwater cultured pearls, where production volumes are substantially higher and nacre is solid rather than bead-nucleated, the AA designation is applied across a wide range of near-round to potato-shaped specimens, and price points vary accordingly.

For Tahitian and South Sea cultured pearls, where individual pearl values are considerably higher and size ranges broader, the AA grade still functions as a mid-market indicator, though the absolute price differential between AA and AAA specimens in these categories can be substantial — sometimes several hundred to several thousand dollars per pearl for larger sizes.

In summary, the AA grade provides a useful, if imperfect, shorthand for pearls that offer genuine visual appeal and wearability at accessible price points, without the premium commanded by top-tier specimens. Its practical value depends on the integrity and consistency of the vendor applying it.

Further Reading

• GIA — Pearl Quality Factors
• GIA — Pearl Grading
• American Gem Trade Association (AGTA)