Size: South Sea pearls are known for their large size, which is a result of the prolonged gestation period of the oysters. The larger the pearl, the more valuable it is.

Luster: The luster of a South Sea pearl is a key factor in its value. The higher the luster, the more valuable the pearl. This is due to the extensive nacre that South Sea pearls develop, which creates a luminous and radiant gem.

Shape: The shape of a pearl is also a significant factor in its value. Spherical pearls are the most valuable, and any deviation from this perfect roundness places a pearl in the baroque category, which encompasses a variety of non-spherical forms. Only a small percentage of pearls achieve the coveted spherical shape, making it a primary determinant of value.

Color: The color of a South Sea pearl plays a pivotal role in its value. The color is composed of two tones: the inner color and the outer overlaying hue. To attain a high-grade classification, the pearl’s color must exhibit uniformity across its entire surface.

Surface Quality: The surface quality of a pearl is another key factor in its overall assessment. While minor imperfections can exist even in the most valuable pearls, discerning buyers often seek pearls with surfaces that are as close to perfection as possible. A high-value pearl should be free from pits, wrinkles, or cracks, ensuring an unblemished surface.

Scarcity: The scarcity of South Sea pearls is a significant factor in their value. The limited geographic presence of the oyster beds and the challenges in establishing new ones contribute to their rarity, which drives up their value.

Rarity of Color: South Sea Gold pearls have a large price range due to the rarity of each color. The darker the shade of gold, the rarer and more special the pearl. The darkest gold pearls in the world come from the Philippines, which is the only source of gold pearls.