The phrase "a most prestigious" is correct and usable in written English.
It can be used to emphasize the high status or reputation of something, often in formal or literary contexts.
Example: "She graduated from a most prestigious university, known for its rigorous academic standards."
Alternatives: "a highly esteemed" or "an exceptionally renowned".
At the Venice Biennale in 1996, he received the Osella d'Oro award, a most prestigious trophy to add to the rest.
Just this past January, he received a most prestigious award from the National Endowment for the Arts for his legendary contributions to jazz.
For the first time, I was going to dine in a restaurant that had wrangled the tip-top award from a most prestigious critic.
In 1888 he was offered (but declined, after a curious sequence of negotiations) a most prestigious chair in Berlin.
This Thai print ad won a Lion the most prestigious ad award at last summer's Cannes Advertising Festival.
It was an enlightened move for Carnegie Hall to include Mr. Ad?in its most prestigious series of piano recitals.
Class A: These are the most prestigious buildings in the most-exclusive sections of a city.
And it has reignited long-simmering tensions in the architectural world over whether women have been consistently denied the standing they deserve in a field whose most prestigious award was not given to a woman until 2004, when Zaha Hadid won.
Those tactics have set off a debate about whether The Enquirer should even be eligible for a Pulitzer, the most prestigious journalism award.
The Los Angeles Public Library has won a National Medal for Museum and Library Service, the most prestigious award for libraries and museums, given yearly to 10 cultural institutions.
That changed in 2013, when she won a Venus Award – the most prestigious prize in the German sex industry – for her role in the film One Night in Bang Cock.
