Where is a kangastan on diamond?

I'm sorry, but there is no known place called "Kangastan" on diamond. It's possible you might have a typo or are referring to a place with a different name.

Could you please provide more context or details about what you're looking for?

For example:

* Are you referring to a specific city, town, or region?

* Is this a fictional place from a book or movie?

* Is there any other information you can share about this location?

Once I have more information, I may be able to help you find what you're looking for.