Pearl

 The mysterious beauty of Pearls, their purity and rarity always attract the people. Considered as a certain divine gift, Pearls have been incorporated into the mythology of every culture and have long been attributed with having great powers.
The Persians called them children of light and believed they were the tears of God. Almost many magical stones mentioned in Arabian, Chinese, and other Eastern tales or legends actually refer to magical pearls.
In Hindu culture, pearls were associated with the Moon and were symbols of love and purity. Hindu texts say that Krishna discovered the first pearl, which he presented to his daughter on her wedding day.
Chapter 69 of Garuda Purana describes seven other types of pearls besides Oyster Pearl (Chandra-moti), viz., pearl from Conch shell (Shankh-moti), Wild Boar’s head (Varaha-moti), Elephant’s head (Gaja-moti), Cobra’s head (Naga-moti or Nagamani), Bamboo stems (Venu-moti), Fish head (Matsya-moti), and from the sky and clouds (Akash-moti or Megh-moti). Naga Mani or Cobra pearl is the rare magical item from Naga Loka. While many Cobra Pearls are literally very bright, we can suppose that its nature of effulgence does not necessarily be external, but possessive of an inner brightness that is visible intuitively and that will clearly impress beyond just the eyes.  Sri Naga Mani have some function of lighting the way in the dark, so that even the most lost can find their way out. And this Perle is maybe some of a Heavenly spark to light the way of Truth even in the darkest of circumstances.
It corresponds with other mythical creatures. Dragons, for instance, in Chinese lore, are known to guard pearls - these pearls are actually produced by them rather than acquired from some external source. This ball with its comma-mark  commonly interpreted as a symbol of yang and yin but remains nevertheless rather mysterious element of the Chinese mythology. There are traces of the importance of the ‘sacred pearl’ of wisdom, or yang energy, in early Taoism, but it is best preserved in Buddhism as the jewel in the lotus, the mani, in the formula Om mani padme hum - "Jewel that grants all desires". The mystical flaming pearl, rendered as a small red or white sphere ringed by a fiery blaze, is often viewed as a metaphor for wisdom, enlightenment and spiritual essence.

Detail of chinese gunfu, official Manchu court robe.

 Chinese Buddhists, identifying the Dragon with the Naga, also identified the ball with their cintamani or precious pearl which grants all desires. In the "Nihongi", the Empress Jingo-Kogo found in the sea "a jewel which grants all desires," apparently the same lost by the frightened Naga Maidens. She also obtained from the submarine palace of the dragon-king the ebb-jewel (kan-ja) and the flood-jewel (man-ja), by which she was able, on at least one important occasion, to control the tides; they are described in the Nihongi as about five sun long, the former white and the latter blue - the colour of the east, whence rain comes; and the moon is controller of the oceanic tides.

Pearls in Islamic tradition holds pearls in even higher regard. The Quran speaks of pearls as one of the great rewards found in Paradise, and the gem itself has become a symbol of perfection.
The Messenger of Allah said, : "I was made to enter Paradise, and in it are stones of pearls". "Verily, for the believer in Paradise there is a pavilion made of a single, hallow pearl. Its length is 60 miles. The believer has wives that he goes to, from one to the other, yet they do not see one another."
In Christianity, of the New Jerusalem, St John wrote:"The twelve gates were twelve pearls, each gate made of a single pearl. The great street of the city was of pure gold, like transparent glass” (Revelation 21: 18-21).
But at the same time this jewelry is present not only at Paradise but also in us. And "Do not give dogs what is holy, and do not throw your pearls before pigs, lest they trample them underfoot and turn to attack you."( Matthew 7:6)

So let's be careful with our most valuable gift, the precious Pearl which we cannot let be taken from us.