I had to look this up. To add to the confusion, chrysoprase is a variety of chalcedony (itself a variety of quartz) with a distinct apple green hue. So the attribution is wrong and you're right.
Chalcedony comes in a wide variety of colors--I've seen VCA in blue chalcedony. It's semi-translucent and periwinkle blue in color.
It's outrageously gorgeous (see below), but like all the translucent stones is a changeling--it can look a muddy gray depending on what it's placed against. The chalcedony in the current collection is generally a very pale lavender with striations. It's the same stone but not at all close in color.
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