Hi LizB888
Ring spots are concerning, and you are probably right to isolate it for now.
Most of the viruses I've seen that leave ring-shaped spots produce multiple rings that are concentric, rather than a single ring without concentric rings. Others here may have personal experience with viruses that look like this; let's see what others have to say. The concentric rings associated with ring spot viruses usually have yellowing or browning associated with the rings.
If you can't test and want to be cautious to protect other plants, tossing it could be the safest option. If you can truly keep it isolated from your other plants, you can see if those rings change at all over time.
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