Pearls from elephant heads, bamboo stems, boar heads, fish mouths, and conch shells are lusterless, even though possessed of other auspicious qualities.
Fish pearls are perfectly round and symmetrical.
They possess a yellowish hue like the scales of the pathenam fish which often inhabit the mouths of deep sea whales. Boar pearls are colored like a boar's tusks and are found only in remote parts of the world. Such pearls are auspicious symbols of the Varaha boar incarnation of the Supreme Lord, Sri Vishnu. Pearls derived from bamboo appear like hailstones in color, and they are found only within bamboo that has grown in a region populated by religious people. Pearls from the cobra's hood are perfectly round, like fish pearls, and they radiate a natural effulgence.