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As a variety of chalcedony, gem silica has a Mohs Hardness of 7 and is durable enough for use in almost any jewelry design. Yet, gem silica is rarely seen in jewelry. The gem is rare, costly, and the supply is limited.
You will probably never see it in mall jewelry stores. The supply is so limited and unpredictable that a large retail chain would be unable to acquire thousands of calibrated cabochons to launch a new product line, then count on more being available if the product line is successful.
If beautiful gem silica jewelry was featured in mall jewelry stores, it might sell slowly because of its high cost and because the average jewelry buyer has never heard of it.
The most likely place to find gem silica in jewelry is in a high-end jewelry store that sells unique one-of-a-kind items. Customers who shop there are the most likely buyers of such rare, expensive, and interesting items. Gem silica is a material for designers and artists rather than mass market manufacturers.
A significant percentage of the gem silica sold as cut stones today is purchased by gem collectors, investors, and speculators. They are a major market for rare, costly, and unusual gems of all kinds.