An article I clipped somewhere -- not in English, but good pictures and possibly can be read through translators:
I was slightly surprised that they date that engraved gem to the 1st century BCE. I hadn't realized that was contemporary to him. My only question would be: do we *know* it's Lucretius the poet and not another 1st c. BCE member of the gens Lucretia:
Lucretia gens - Wikipedia
en.wikipedia.org