This gorgeous acrylic cabochon was molded by West German artisans in the late 1960s.
In the years following World War II up until about 1980, the West Germans turned out some of the most amazing thermo-process plastic (of which Lucite, a trademark of the DuPont Co., is perhaps the best-known example) in the world.
This cabochon is one result of that work.
It has a clear base through which shades of purple -- mainly amethyst -- have been swirled.
Then a batch of these were put in a tumbler with soap granules to take the shine off of them.
Personally, I like the matte ones even better than the shiny ones.
Take a gander at the second image for an idea of what can be done with them.
Even though such cabochons were produced en masse, no two were alike -- except in their beauty.
The 40x30mm measurement converts to a tad more than 1-1/2" by a tad less than 1-1/4".
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