What carat gold are these?
I don't believe that we have had them tested. Some of the objects such as the Lime Container are actually gold alloys, while others such as the spider are just listed as gold.
Wow, so shiny!
Columbia was an important center of gold working in Central and South America. The Quimbaya culture especially is known for perfecting the technology behind alloys and lost-wax casting!
Is this a musical instrument?
It's not a musical instrument, but it is hollow. This is known as a "poporo" a container for powdered lime. The lime was created from burnt seashells and served as a catalyst, activating the stimulant in coca leaves.