This ring is sooo tiny - it has to be a child's ring.  It is a size 2.  The inside is marked with what appears to be 925, but it's unclear.  There is also another marking which I cannot make out.  The stone in the center is 5mm and appears to be a black onyx.  I have been told that this ring could possibly be turn-of-the-century, but I'm not sure.  In any case, the ring is in very good condition - a very delicate and thin band.