1. Luster
Luster is one of the most important indicators of pearl quality.
A pearl with high luster has bright, sharp reflections, and its surface appears deep and expressive.
With weaker luster, reflections may be blurred and the pearl itself may look dull or chalky.
GIA identifies five main luster levels: Excellent, Very Good, Good, Fair and Poor.
When choosing earrings or a necklace, try assessing the pearls in soft daylight. Good luster is particularly evident when light and dark objects are reflected on the surface.
A PEARLS LAB tip: do not judge quality solely by the brightness of a photograph. Heavy image editing and studio lighting can suggest a luster that the buyer will not see in person.
2. Size
Size is usually measured in millimeters.
All other factors being equal, larger pearls of the same type are rarer and may cost more.
But large size alone does not mean high quality.
For example, a small pearl with excellent luster and a beautiful surface may look more attractive than a larger, dull one.
For earrings, consider the proportions of the face, earlobe and setting as well as pearl size.
In a necklace, pearl size affects the overall character of the piece: small pearls create a more delicate look, while large ones make a stronger statement.
3. Shape
Pearls can be round, near-round, oval, drop-shaped, flattened or baroque.
Round pearls are traditionally highly valued because a perfect spherical shape is relatively rare.
However, that does not mean baroque pearls are poor quality.
Baroque pearls have distinctive irregular shapes and can be used in original designer jewelry.
The key is to assess shape in the context of the pearl type and the artistic intention of the piece.
4. Color
Pearls are not only white.
They come in cream, pinkish, golden, gray, dark and other shades.
Professional assessment considers a pearl's bodycolor, overtones and iridescent surface effects.
It is important to understand that color alone does not determine quality.
White pearls are not necessarily better than pink ones, and dark pearls are not necessarily more expensive than light ones.
Pearl color may also be natural or modified by treatment. These are distinct characteristics that should be differentiated in a product description.
5. Surface quality
Pearls form inside living organisms, so minor surface characteristics are entirely natural.
A pearl may have depressions, irregularities, growth lines and other features.
All other factors being equal, fewer noticeable blemishes generally mean a higher assessment of surface quality.
There is an important nuance, however.
A small natural surface characteristic does not make a pearl an imitation or unsuitable for jewelry.
Deep damage and pronounced structural irregularities, on the other hand, may affect durability as well as appearance.
6. Nacre quality
Nacre is the material from which a pearl forms.
Its structure and quality influence a pearl's appearance and durability.
In some types of bead-nucleated cultured pearls, the thickness of the nacre layer is particularly important.
A layer that is too thin or damaged can negatively affect luster and the surface's resistance to wear.
However, nacre thickness cannot be reliably measured from a photograph alone.
Gemological laboratories may use specialized examination methods to assess the internal structure precisely.
7. Matching
This factor is particularly important for pearl necklaces and earrings.
A necklace may contain dozens of pearls. For the piece to look harmonious, they need to be matched for size, shape, color, luster and other characteristics.
In earrings, it is important that the two pearls complement each other.
Some designer pieces deliberately combine different pearl shapes or shades. In these cases, a thoughtful composition matters more than absolute uniformity.
A beautiful pearl necklace is the result of careful matching, rather than simply a collection of individual pearls.
Why do similar pearl necklaces have different prices?
Imagine two necklaces with pearls of the same diameter.
In the first, the pearls have bright luster, a clean-looking surface and well-matched shades.
In the second, the luster is noticeably weaker and differences between the pearls stand out more.
Despite the identical size, the perceived quality and price of these pieces may differ.
The final price also depends on the pearl variety, origin, clasp material, complexity of assembly and other features of the jewelry.
That is why comparing pearl jewelry solely by pearl diameter is misleading.
How to choose quality pearl earrings, a necklace or a ring
When choosing pearl earrings, consider luster, the harmony of the pair, pearl size, the security of the setting and the comfort of the fastening.
For a necklace, the quality of assembly, the thread's condition, knots between pearls and a reliable clasp matter alongside the characteristics of the pearls.
When choosing a ring, consider the pearl's shape, how it sits in the setting and how well the piece suits your lifestyle.
And, of course, look at actual photographs and videos of the piece.
The PEARLS LAB approach to choosing pearls
We believe buyers should understand why one piece of pearl jewelry differs from another.
The beauty of pearls comes from many details: depth of luster, shape, shade, surface quality and how harmoniously the pearls look together in the finished piece.
That is why we explain pearl characteristics in clear language and help people make informed choices.
PEARLS LAB — pearls you want to wear as much as admire.
Frequently asked questions
Which pearl quality factor is most important?
GIA identifies luster as one of the most significant factors, but the overall assessment depends on all seven characteristics together.
Are larger pearls always better quality?
No. Size affects value, but cannot replace an assessment of luster, surface, nacre and other factors.
Are baroque pearls inferior to round pearls?
No. Baroque pearls differ in shape and can have high luster and good surface quality.
Why should the pearls in earrings look similar?
Consistency in size, color, shape and luster gives the pair a harmonious appearance, unless the design calls for deliberate asymmetry.
Can pearl quality be determined from a photograph?
A photograph allows a preliminary assessment of appearance, but cannot replace examining the jewelry and professional testing.