It's about the size of a small bird's egg and it's no wonder it's called the

Pink Star

because the light shimmers and dances around it.

It is a diamond that can be awarded, according to estimates, for more than 21 million dollars when it goes up for auction on October 7 at Sotheby's headquarters in Hong Kong.

It belongs to the listed 'Fancy Vivid' variant, weighs 11.15 carats and was mined from the Williamson mine

in Mwadui, Tanzania.

This operation, one of the oldest in the world, is distinguished by producing saturated pink diamonds, according to Sotheby's.

Pink is one of the rarest colors found naturally in diamonds and only a very small proportion of these are of a color strong enough to be classified as 'Fancy Vivid Pink'.

Additionally, most are relatively small in size, weighing less than 10 carats, making this specimen considered a rarity.

It was first presented in London and toured Dubai, Singapore and Taipei before arriving in Hong Kong.

This type of jewelry is especially popular in Asia, according to Regine Ngan, Director of Asia and Head of Sotheby's Jewelry Department.

"Pink diamonds are really rare already, and especially Williamson's,"

she explains.

The auction house expects some private clients to bid from that continent.

"We are delighted to have it here. We have auctioned other great Fancy Vivid Pinks before. That color is very attractive to women and we have many private clients who could bid from Asia," says Ngan.

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