Chrysoprases are unremarkable low-value gems found in sedimentary layers.
In Real Life
Chrysoprase is the proper name for a green chalcedony, also known as Australian jade. It's relatively rare.
A chrysoprase coffer. It is encrusted with Pink tourmalines, Light yellow diamonds, and Clear diamonds and encircled with bands of gold. On the item is an image of flowers.
[SOLID_DENSITY:2650] Common to quartz gems