Because there is no universal grading system, focus on these physical attributes:

The type of pearl you choose determines the necklace's price, size, and overall look.

: 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.

: Thicker nacre equals better durability and deeper luster.

: Primarily from China, these are the most accessible and budget-friendly. They offer the widest variety of natural pastel colors (pink, peach, lavender) and shapes.

: Measured in millimeters (mm). A 1mm increase may seem small, but it can double the pearl's volume and significantly increase the price.

: Naturally dark "black pearls" from French Polynesia. They feature exotic overtones like peacock green, blue, and aubergine.

: Look for fewer blemishes, pits, or scratches. While minor irregularities are common in natural gems, cleaner surfaces command higher prices.