You have an pretty southwest style setting with a deep blue lapiz stone in a bezel setting in the center.

The band is 1/8 inch thick at thinnest point and 1/2 inch at face

Lapiz is 3/8 inch

Tests positive for some degree of silver

May be mexico or alpaca silver or silver plate

Certainly polishes and has payola like a sterling

Sz 6.5

4 g in weight

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