钻石十字是在南极附近船底座内的一个星群，由四颗明亮的恒星组成：南船五（船底座β）、海石五（船底座υ）、南船三（船底座θ）、南船四（船底座ω）。这四颗亮星驵合成的造型几乎是完美的金刚石形状，因此被命名为"钻石十字"，但是要在北纬20°以南的地区才能完整的看见这个星群。这个星群与醒目的南十字座与船帆座的伪十字架有着相似的形状，并且也和他们一样在十字交叉处的中心没有恒星，外型就像钻石或是风筝的形状。虽然钻石十字和伪十字都会被误认为南十字座，但是伪十字因为纬度和南十字座相似，因此被误认的机会较高。

The Diamond Cross is an asterism in the southern constellation Carina. The Diamond Cross is composed of four bright stars: Beta, Theta, Upsilon and Omega Carinae. These four bright stars create an almost perfect diamond shape, hence the name "Diamond Cross". The entire asterism is visible to all observers south of 20°N latitude. It bears a striking resemblance to Crux (The Southern Cross) and the False Cross, and, like them, it lacks a central star in its cross pattern, creating a diamond-shaped or kite-like appearance. Both the Diamond Cross and the False Cross are sometimes mistaken for the true cross Crux, although the False Cross has always been a worse deceiver than the Diamond Cross, because most of its stars have approximately the same declinations as the stars of Crux.