Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8) is a calcium-enriched feldspar mineral first identified in Labrador, Canada, which can display an iridescent effect (schiller).
Read on WikipediaGrey stone that shimmers like oil on water.
Labradorite is a cool grey, close to teal.
It can be described as cool, muted, greyish and dusty.
Set in black, because black reads best on it.
Labradorite ((Ca, Na)(Al, Si)4O8) is a calcium-enriched feldspar mineral first identified in Labrador, Canada, which can display an iridescent effect (schiller).
Read on WikipediaNoun