By Diamaris Martino
CHICAGO (CBS) — Some diamonds aren’t meant to be just for rings.
The 163-carat stone is the centerpiece of an emerald and diamond studded necklace.
The centerpiece is the size of a matchbox, and is set to be auctioned off at Christie’s “Magnificent Jewels” sale in Geneva, Switzerland.
Originally it was part of a 404-carat rough stone, that was the largest diamond ever discovered in southwest Africa.
The necklace is expected to be sold for up to $35 million.