Yesterday’s Thrift Store find. Any info about this?

Found a ring yesterday. It looks like it's sterling silver. Marked "925" inside, also "RLM" and the other side of the ring is marked "Thailand."

Here are some pictures:
Sterling Silver Ring. Shown under natural sunlight. Click for a high resolution photo.Sterling Silver Ring. Shown under natural sunlight. Click for a high resolution photo.
Sterling Silver Ring. Shown under natural sunlight. Click for a high resolution photo.Sterling Silver Ring. Shown under natural sunlight. Click for a high resolution photo.
Sterling Silver Ring. Shown under natural sunlight. Click for a high resolution photo.

Here are photos showing the markings on this ring:
Sterling Silver Ring, markings shown, "RLM 925". Shown under natural sunlight. Click for a high resolution photo.Sterling Silver Ring, markings shown, "THAILAND". Shown under natural sunlight. Click for a high resolution photo.

My eBay coach/mentor says we can't list this until I have the size determined for certain. It seems to be about a 7, but I'm not absolutely certain yet. I ordered a "Mandrel Sizer Measuring Stick." I might just take it to a jeweler and have it measured so I can list it.