All precious metals are tested and guaranteed, any Native American jewelry. Referred to as Silver or Sterling is guaranteed to be a minimum of 90% (coin).
Silver and possibly higher content. Anything marked is guaranteed to be what. It's marked, most bracelets are photographed on a 6 wrist (non hairy), rings. Photographed on the appropriate sized finger when possible.
The measurement is not given in the description then inside circumference is. Shown where the metal meets the number on the the cloth tape measure.