Pietersite Earring - The Unique Crystal Unique crystals like pietersite are found only in Windhoek, Namibia. Pietersite may be identified by its uniformity and variety of colors. Due to its resemblance to a ferocious desert storm, it is often referred to as the "Tempest." The patterns in the hues of gold, blue, brown, and black display the stone's lovely metamorphosis. Unique crystals like pietersite are found only in Windhoek, Namibia. Pietersite may be identified by its uniformity and variety of colors. Due to its resemblance to a ferocious desert storm, it is often referred to as the "Tempest." The patterns in the hues of gold, blue, brown, and black display the stone's lovely metamorphosis.