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This is a 1970's-1990's modernist polished silver cuff bracelet
with one bezel-set, abstract square shaped polished red jasper stone.
This is similar to Mexican jewelry from the 20th century.
It is odd that it has no mark. Look on the edges and in odd places.
I am so sure it is sterling. If it really is not marked, then it would be rhodium plated
and have a value of $10.
If it is marked 925 or sterling Mexico then it is valued at $40 to $65.
Here is an example of a similar and look at this listing to see where this one was marked.