(IDEX Online) - A 181.61-carat gem described as "the world's largest flawless Paraiba tourmaline" is to be auctioned at ...

The tourmaline’s name is derived from the ... its lagoon blue colour rather than its clarity, demand for the stone sent prices escalating to $2,000 per carat at gem shows around the world ...

Doris Hangartner invites readers of her coffee table book Gem Love Letters to open it randomly and be drawn to the coloured stone that resonates ... or a joyful Paraiba tourmaline.