The breast star of a Knight or Dame Grand Companion of the New Zealand Order of Merit (GNZM) is worn on the left hand side.
The breast star has eight points, in gold. Each arm bears in relief a representation of a fern frond. Superimposed in the centre is a small representation of the badge of the New Zealand Order of Merit.
From : http://www.dpmc.govt.nz/honours/overview/nz-royal-honours-gallery