I like a one-word sentence occasionally. The full sentence would read:
Is -- seoid -- don bhean -- é -- fear -- dá leithéid -- seo.
-- - is -- a jewel -- to the womam -- he -- a man -- of his like -- this
A man such as this is a jewel.

dá leithéid = de + a (possessive adjective) + leithéid
de --of --a --his -- leithéid -- like -- i.e. like him.

Note the word order of an "is" sentence.
Learn it over and over again and at every opportunity.
It is used very widely in the language.