A single South Sea pearl can cost $1,500, and a necklace can reach over $200,000. So, how are these pearls grown? And what makes them so expensive? More from Retail South Sea pearls are the ...

In 1969, the sea stone was sold at Sotheby's ... This makes it the most expensive pearl necklace sold at auction. Sold by Christie's in 2013, this extravagant 35-inch collar is strung with ...