Better daylight photos of the stone can be added if needed and thank you for taking the time to have a look. Source is a recent storage room auction haul flip
Macro & Micro photography and depth of field are constantly at war with each other. Depth of field on an orb you tend to loose a few digits of sanity in the editing process when the sweet spot zeros in on a small percentage of the entire view.
hopefully the shots below give you the perspective you request
The stone looks to be stabilized Boulder Turquoise. Before treatment the brown stone would of been a lighter color. Could be Kingman or some other sky blue brown matrix Turquoises. Neat piece.
That is interesting turquoise… i think it might be Gilbert see photo of a similar cuff i purchased some years ago. The seller was a good authority, but i feel that there is another possibl!e attribution: Halley’s Comet.
Gilbert tends to be a bit warmer and glossy.