The phrase "a capstone of the" is correct and usable in written English.
It can be used to describe something that serves as a culminating achievement or a significant part of a larger project or concept.
Example: "The new policy is seen as a capstone of the administration's efforts to improve public health."
Alternatives: "a pinnacle of the" or "a crowning achievement of the".
The city's planned Paris-style bike-sharing network, a capstone of the Transportation Department's efforts to encourage two-wheeled transit, has not generated much interest.
The governor called it a "capstone" of the $9 billion makeover of Kennedy, one that would create 6,000 permanent jobs and signal to the aviation industry that "New York has re-emerged as a home for aviation".
The Startup Awards are a capstone of the studio curriculum, a key component of the master's experience at Cornell Tech which brings together multi-disciplinary teams to solve real-world problems.
This past weekend was a capstone of sorts for the media mogul, as "Lee Daniels The Butlerr" opened first at the box office.
In many ways, this announcement placed a capstone on the grave of the 1996 Telecom Act's biggest promise to America: genuine competition in communications service offerings.
As a capstone of research progress, 2011 marked the first reports of high throughput sequencing of SCCHN tumors, with these efforts identifying unexpected players such as Notch as frequent subject of mutation, spawning new hypotheses for future research.
The Portraits exhibition is a capstone of sorts for LeFalle-Collins' career as a freelance curator.
South Sudan's independence was a capstone of diplomatic efforts to end a decades-long civil war between the north and south.
The new look, imperfect as it may be technically, is a capstone of real change, not a marketing gimmick.
Geographically, he is well situated to make Lithuanian music a capstone of his trans-Atlantic fusion.
