珍珠是怎樣變成圓形的 - BBC 英伦网
我們知道牡蠣是如何製造珍珠的，但它們是如何讓珍珠變成正圓形的呢？有一種新的理論認為，原因在於它們擁有一種可以使之在貝殼內旋轉的獨特結構。
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｜originally written by Lin
儘管當有沙粒或寄生生物等外來微粒進入牡蠣、蛤蚌和貽貝的軟體後，便會形成珍珠。但影片中為刻意剪輯拍攝的，並非實際的情況，影片中也有無法形成的塑膠碎鑽。
References
https://www.bbc.com/ukchina/trad/vert_fut/2016/02/160222_vert_fut_how-pearls-get-their-round-shapehttps://www.bbc.com/ukchina/trad/vert_fut/2016/02/160222_vert_fut_how-pearls-get-their-round-shape
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