The Marie-Thérèse Pink, thought to have belonged to Marie Antoinette, was auctioned by Christie’s in New York.

This morning, at Christie’s New York’s Magnificent Jewels sale, just minutes after a Mughal carved Colombian emerald necklace ...

They are generally opaque, but sometimes translucent and suitable ... Some of the blocks are also displayed as feng shui stones. The tourmaline often has light red to pink colors, but the crystals are ...