Okay, if you want to call it black onyx, go ahead. Everybody else in the industry does. But by definition, onyx should have straight parallel stripes of black and white … and these gems don’t. The ...

“I think the idea of purple and lavender chalcedony being lumped with blue chalcedony dates from the yo-yo who coined the term ‘Holly Blue,'” says gem cutter—gemologist Will Johnson, owner of Premier ...

Chalcedony is a mesmerizing stone, forged slowly over centuries on rocky, waterfront outcrops and morphing into this semiprecious gem. Waxy and translucent, it has an inner glow that suggests the ...