I know nothing about this....to me, I buy jewelry based upon its beauty, not its worth in dollars, probably because I never plan on having to trade it in or sell it. Googled "amber fake or real" and got this ...hope it helps..I always like the taste tests myself
Quick Tip: Telling real Amber from Plastic forgeries.... One of the simplest non-destructive tests that you can do yourself is to clean and taste the specimen. Carefully washing with soap and water, then with just water, should leave a clean specimen ready for this test. Lick the specimen slowly several times, allowing the subtle taste to linger. It should be extremely subtle - real amber has almost no taste at all, leaving at most a very slight, tingly sensation. We think this "taste" may actually be just a touch sensation, not a true response of the taste buds. Most plastic or other polymer forgeries, on the other hand, carry a distinctly nasty taste that screams, "Imitation!" Don't be fooled, remembering this simple taste test can save you considerable trouble in your adventures with amber.