CIM 550 Chalcedony

Chalcedony - Similar to Halong Bay, but more opaque - it's not a completely opaque colour, but not a misty opal like Halong Bay.

And the colour is such a dead-on match for blue Chalcedony that I am now deeply suspicious of the last batch of blue chalcedony that I bought.

Beautiful colour - I will be buying this one.