The Gem Cluster, NGC 3293, was discovered by Nicolas Louis de Lacaille in 1751 from his observatory at the Cape of Good Hope. His description reads "small heap of 4 small stars in the form of a rhombus". It is approximately 7.500 lightyears away. 
NGC 3293 is a massive cluster with over 100 B-stars. It is located at the border of the H2 region Gum 30. The other H2 region in the image is Gum 31 with the embedded cluster NGC 3324. The center of NGC 3324 is the star system HD 92206 with 3 O-stars that deliver the energy for the surrounding emission nebula. 
These molecular clouds are part of the larger Carina Nebula Complex, located northwest of its center. Above the Gem cluster is another, small and round nebula with the star HD 92383 in its center.