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https://www.thesprucecrafts.com/identifying-and-testing-jet-149512
Testing Jet When touched by a hot pin (carefully, and in an inconspicuous location to avoid damaging the jewelry), jet produces a coal-like odor. For a less-risky method of testing, scrape an inconspicuous area of the piece in question onto a rough surface, like the back of a ceramic tile or the bottom of a piece of unglazed porcelain.
https://www.rubylane.com/blog/categories/jewelry/jet-proper-use-and-identification/
Dec 26, 2007 · Jet will warm to the touch quicker than black glass (French Jet), and both materials will warm to the touch quicker than a mineral like chalcedony. New jet jewelry pieces are still being produced, but its last extensive use was during the 1920’s and 30’s as beads for “flapper” jewelry.
https://www.gemsociety.org/article/jet-jewelry-gemstone-information/
Choose an inconspicuous spot to test any finished gem or jewelry piece. Synthetics. In addition to plastic, black glass can simulate jet gems. However, true jet is warmer to the touch than glass. “French Jet” was a popular glass imitation during jet’s 19 th century heyday.
https://www.whitby-jet-jewellery.com/blog/how-to-test-whitby-jet-pieces-picked-up-from-the-seashore/
We found a few sea washed pieces and made a short video to show how to test the quality of the jet. If chalked on a piece of sandstone the best quality Whitby jet should leave a light brown/ginger mark. This is the only jet we ever use in our jewellery. Poor quality Jet will leave a dark brown mark.
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