Iridium and osmium vie with one another for the distinction of being the most dense element. Both have a density close to 22.5 grams per cubic centimetre. Compared to the osmium sample, you can see that iridium has a slightly warm yellow hue. 

A single two gram arc-melted pearl of pure iridium together with a display vial with Ir engraved on the lid. 

A single five gram arc-melted pearl of pure iridium together with a display vial with Ir engraved on the lid. 

A single ten gram arc-melted pearl of pure iridium together with a display vial with Ir engraved on the lid.