The wiki article on malachite shows a photo of what could almost be this very stone! The photo illustrates why the stone in this necklace is so thick. The "black river" in the stone is a deep pocket of malachite crystals and Leigh cut the stone to maximize the beauty of the river flowing through. This did not make it easy to set, but I hope you will like the result.
The high bezel of the setting has layers which echo the swirls in the stone. The edge design is an overlay as well. As the stone sat on my workbench, I became very concerned about it because the edges in the chalky white part seemed to be turning to ... well, chalk. So I used Opticon to stabilize the stone. Opticon is a two-part resin normally used to fracture seal emeralds. The stone is soaked for an extended time to allow the resin to enter deeply into it before the hardener is applied. I feel confident now that the stone is strong and stable.
The necklace includes turquoise which varies from darker to pale blue, like the centerpiece itself; also apatite crystals and black spinel which add a bit of sparkle. I put a jaguar overlay on the back of the setting to reflect the Amazon Rio Negro theme. I hope you will order it today and let the stone take you on an adventure.