: Thicker nacre equals better durability and deeper luster.
: The most critical factor. High-quality pearls have a sharp, mirror-like reflection. If the reflection is dull or chalky, the nacre is likely thin. pearl necklace buying guide
: Look for fewer blemishes, pits, or scratches. While minor irregularities are common in natural gems, cleaner surfaces command higher prices. : Thicker nacre equals better durability and deeper luster
: Measured in millimeters (mm). A 1mm increase may seem small, but it can double the pearl's volume and significantly increase the price. pearl necklace buying guide