In 1907 Bertram Goodhue built a townhouse at 106 East 74th Street (demolished in the 1920's) with a Gothic/Tudor front. The main facade is dominated by leaded glass windows set in bays, Tudor style, but historic photographs reveal no more.

In 1916 House Beautiful wrote "the triple window is leaded with diamond quarries."

What might "diamond quarries" mean in such a usage?