Nice modernist style rectangle top design with inlaid onyx gemstone. 

• Size: 8. Top of the ring is 1/4" wide.
• Type: Pre Owned Retro Vintage from the 1980's.
• Condition: Darkened patina. Onyx has a small corner area rough edge when viewed under magnification.
• Materials: Sterling silver, onyx.
• Markings: Marked 925 on the inside of the band. here is another marking in the band but it's pretty unreadable from age. It looks like it may be TA- something so it's possibly a Taxco ring, but even with my jeweler's loupe I couldn't read it.
• Weight: 9.0 grams.