Cabuchon Black Opal 925 Silver Studs (Fiery)

Gemstone: Black Opal (The fire flashes are really good in real life. They vary from stone to stone, but these are really fiery.)
Origins: Australia
MOHs hardness:  6-6.5/10
Gemstone size: 5mm x 4mm
Setting Material: 925 silver, rose gold plated
 
What Gemstone is Black Opal?
Australian black opals are the most valuable and widely known type of opal. Black opal is characterised by a dark body tone which can range from dark grey to jet black.
 
Unlike ordinary opals, black opals have carbon and iron oxide trace elements present, which cause the unusual darkness of the stone. Because of their dark body tone, the orange fire that can also come in other colours of the rainbow,  stand out much better in a black opal  than lighter opals.
 
Purchase notes: Comes in a velvet sleeve and silver polishing cloth