This ring is an Avon reproduction of an Art Deco style of ring.  It is made of a gold tone setting with a nicely faceted hematite stone measuring 5/16" long (14mm).  The stone is set with a closed back with a stamped makers mark for Avon.  Avon is known to have made excellent quality reproduction jewelry.  The condition is excellent.  A size 8 1/2 - 9.

Side view: