Montezuma is a sliver-rich navy blue that was an attempt to remake Prussian Blue and it is similar to that but I reckon it’s more of a dead ringer for CiM Class M Planet.
In rod form Montezuma is a dark blue but when heated it gets a marine green tinge. If you don’t encase the bead this will remain, but a layer of encasing magically does away with the green, leaving a rich navy blue. This glass behaves exactly the same way as Class M Planet did, even down to its occasional shocky-pop here and there. (Nothing serious – just warm it slowly and carefully.) That quirk aside, the glass is a doddle to use.
The photos of the spotty beads are Montezuma encased with Effetre Super Clear 006, with spots and spacers in CiM Ra. The picture at the top of this post is just Montezuma on its own.
The beads were photographed indoors in natural daylight.