The mark is Hecho en Mexico (Made in Mexico), the other mark is Alpaca, for the metal, an alloy of nickel, copper and zinc, no silver. The inlay could be Abalone or a blue resin with chips in it to resemble turquoise. Pics would of course help narrow it down.
It says Sterling Mexico around the 925, the eagle 3 mark for Taxco and a conjoined JF for Jeronimo Fuentes who did lots of enamel pieces. They are often mistakenly attributed to Jose Frederico.
That eagle head mark has no relation to the eagle mark used on silver. This most likely made of alpaca, an alloy with no actual silver in it. Unfortunately many alpaca pieces are falsely marked sterling/925.
Since they are Mexican then they aren't Indian. The stones aren't Turquoise, they are white chips of some sort in a colored resin, this technique is used a lot in Mexican jewelry. T marks like these were used after 1979 and there were 100's issued, many were just jobbers, if it was a name maker ther...
That's actually somewhat incorrect. There is no one named Tracey Knifewing. Ray Tracey and Knifewing Segura used to collaborate on pieces and used that mark, although I am not sure if I have ever seen one of their dual pieces. Ray Tracey does work like this, and has for a while, and still uses the s...
The S925 mark and construction are indicative of Chinese origin. The 80's date is probably spot on. They are lovely but were inexpensive to purchase and usually made in multiples.
The piece is from Mexico City, as shown by the DF mark, Marmolejos worked out of Taxco. It's also an extremely common tourist design, not likely done by a known artisan.
Bangles are solid round/oval bracelets, this is a cuff. It's most likely Native American/Navajo but I didn't find the mark in my books. It's highly likely sterling or at least coin/900 silver but would have to be tested to be sure.