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NCIS: Sydney – Season 3, Episode 18 Rough Diamond

Play trailer NCIS: Sydney – Season 3, Episode 18 Rough Diamond Aired May 5, 2026 Crime Drama Action Adventure Mystery & Thriller Play Trailer Watchlist
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The death of a former Marine wanted for murder leads the team to a sinister plot involving a disgraced journalist, one of Australia's richest men and lab-grown diamonds.
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NCIS: Sydney — Season 3, Episode 18

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Cast & Crew

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Morgan O'Neill

Creator

Olivia Swann

NCIS Special Agent Michelle Mackey

Todd Lasance

Sergeant Jim "JD" Dempsey

Sean Sagar

NCIS Special Agent DeShawn Jackson

Tuuli Narkle

Constable Evie Cooper

Mavournee Hazel

Bluebird "Blue" Gleeson
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NCIS: Sydney — Season 3, Episode 18

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Critics Reviews

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Jasmine Blu TV Fanatic May 6
4/5
The fun, down-to-earth personal elements of the series were at their most entertaining, and then they left us with that ending just in time for the supersized finale. Go to Full Review Read all reviews

Episode Info

Synopsis The death of a former Marine wanted for murder leads the team to a sinister plot involving a disgraced journalist, one of Australia's richest men and lab-grown diamonds.
Director
Catherine Millar
Creator
Morgan O'Neill
Executive Producer
Morgan O'Neill, Sara Richardson, Sue Seeary
Screenwriter
Morgan O'Neill, James Cripps, Jessica Tuckwell
Network
CBS
Rating
TV-PG (V|L|D)
Genre
Crime, Drama, Action, Adventure, Mystery & Thriller
Original Language
Australian English
Release Date
May 5, 2026