![Study on the effect of heat treatment on amethyst color and the cause of coloration | Scientific Reports Study on the effect of heat treatment on amethyst color and the cause of coloration | Scientific Reports](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fs41598-020-71786-1/MediaObjects/41598_2020_71786_Fig1_HTML.jpg)
Study on the effect of heat treatment on amethyst color and the cause of coloration | Scientific Reports
![What are these black spots? I never noticed them before, could it be caused by something like heat? I had it in the car for a few days. Or have I just What are these black spots? I never noticed them before, could it be caused by something like heat? I had it in the car for a few days. Or have I just](https://preview.redd.it/9q17nm60s6151.jpg?width=640&crop=smart&auto=webp&s=699ce31398d4905cde27ef6bc4c26fd86bfcff12)
What are these black spots? I never noticed them before, could it be caused by something like heat? I had it in the car for a few days. Or have I just
![Amazon.com: JIC Gem Mix 11-13 pcs Rough Amethyst & Citrine Crystal Point Raw Natural Stones for Jewelry Making, Wire Wrapping, Reiki Crystal Healing (Deep Color) : Home & Kitchen Amazon.com: JIC Gem Mix 11-13 pcs Rough Amethyst & Citrine Crystal Point Raw Natural Stones for Jewelry Making, Wire Wrapping, Reiki Crystal Healing (Deep Color) : Home & Kitchen](https://m.media-amazon.com/images/I/61k9r3EgZuL.jpg)
Amazon.com: JIC Gem Mix 11-13 pcs Rough Amethyst & Citrine Crystal Point Raw Natural Stones for Jewelry Making, Wire Wrapping, Reiki Crystal Healing (Deep Color) : Home & Kitchen
![Can anyone tell me why my crystals are getting black specks inside the amethyst and outside of the carnelian? : r/Crystals Can anyone tell me why my crystals are getting black specks inside the amethyst and outside of the carnelian? : r/Crystals](https://preview.redd.it/o28hq5treyi21.jpg?auto=webp&s=903994c28894dfb2ad7b740a53c0dbd1716c2257)
Can anyone tell me why my crystals are getting black specks inside the amethyst and outside of the carnelian? : r/Crystals
![Sun damaged amethyst?! These black dots weren't there before, I left a few crystals by the window for a whole year and when I found them again, they all had black dots Sun damaged amethyst?! These black dots weren't there before, I left a few crystals by the window for a whole year and when I found them again, they all had black dots](https://preview.redd.it/d6r7eisxvo511.jpg?width=640&crop=smart&auto=webp&s=4d52c915df2724a660e1678dcfae231211224703)
Sun damaged amethyst?! These black dots weren't there before, I left a few crystals by the window for a whole year and when I found them again, they all had black dots
![Brown-black spots in and on my amethyst cluster. Not a change- always looked this way. It looks like little flees decided to walk across the surface, with some deciding to jump in Brown-black spots in and on my amethyst cluster. Not a change- always looked this way. It looks like little flees decided to walk across the surface, with some deciding to jump in](https://external-preview.redd.it/tpdOSKEazVbOS_plnDE1tapoF961jsq9chr_l3qTfKw.png?format=pjpg&auto=webp&s=8f3413f996ac709f44c45967f5d1b1ed223d466a)