Would diamonds from the Canadian diamond mines be especially attractive to the cold entities? Two of them look like they are north of the Arctic Circle.
The Jericho Diamond Mine was the third diamond mine in Canada and the first in Nunavut territory. It is located about 250 miles northeast of Yellowknife, Northwest Territories. The mine was opened by Tahera Diamond Corporation and produced diamonds from 2006 to 2008 but the company lost money. In 2010, Shear Minerals, Ltd. acquired the property with the intent of bringing the mine back into production.
https://geology.com/articles/canada-diamond-mines/