Begonia - Aquamarine has a star shaped formation foliage with a splashed grapes like colors - it is indeed very difficult to describe the coloration as you can view the picture above.
However when the begonia grows in shaded area it will be appearing in a green tones. It is a rhizomatous type begonia with green to silver colored foliage.
I tried to propagate this using a leaf cutting on a mop wick system but it was unsuccessful. I may try again once this plant had grown big and had established itself.
Currently I had replanted it from a soil medium into a mop wick system and hoping it will slowly spring back to life, as it was slowing going dormant in the earlier medium.
Only time will tell the progress of this particular plant.
Here is the link where I had put together a list of all the begonias that I had come across. A database of all the different types & their characteristics. Please click on the link on the title above for the post.