I had a difficult time finding information of Ceruleite. I just bought a ring and 3 pendents to sell. I figured it was good for you and I to know a little about this stone.
Polished Ceruleite Gemstone can have a far deeper blue color than that of the rough stone. Due to its rarity, good,material is hard to cut and quite expensive. You’ll see few cut stones, even in museum collections.
The type locality for this gem is the Emma Luisa Mine in Huanaco, Chile. Chile remains an important source for this gem.
Southern Bolivia has produced cabbing material of fine color. However, the total amount of this yield may not exceed several hundred pounds.
Nodules usually range in size from less than 1 inch up to several inches. Typically small, this material yields Cabochons only.
You’re more likely to find Ceruleites, if at all, in mineral collections than in jewelry collections. These gemstones have a lower hardness (5-6) than more common jewelry stones such as Quartz. Therefore, store them separately from other gems to avoid contact scratches. Use protective settings for ring wear. However, necklace and earring use should pose fewer risks.
Avoid cleaning ceruleites with any mechanical cleaner. Clean these gems only with a soft brush, mild detergent, and warm water. Don’t use any other cleaning solutions, since ceruleites may react to chemicals in them. Wipe pieces with a damp cloth after wearing them.