Main Difference
The main difference between Topaz and Amethyst is that the Topaz is a nesosilicate mineral and Amethyst is a mineral, quartz variety
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Topaz
Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al2SiO4(F, OH)2. Topaz crystallizes in the orthorhombic system, and its crystals are mostly prismatic terminated by pyramidal and other faces. It is one of the hardest naturally occurring minerals (Mohs hardness of 8) and is the hardest of any silicate mineral. This hardness combined with its usual transparency and variety of colors means that it has acquired wide use in jewellery as a cut gemstone as well as for intaglios and other gemstone carvings.
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Amethyst
Amethyst is a violet variety of quartz.
The name comes from the Koine Greek ἀμέθυστος amethystos from ἀ- a-, “not” and μεθύσκω methysko / μεθύω methyo, “intoxicate”, a reference to the belief that the stone protected its owner from drunkenness. The ancient Greeks wore amethyst and carved drinking vessels from it in the belief that it would prevent intoxication.
Amethyst is a semiprecious stone often used in jewelry and is the traditional birthstone for February.
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Topaz (noun)
A impurities.
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Topaz (noun)
An often clear, yellowish-brown gemstone cut from this.
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Topaz (noun)
A yellowish-brown color, like that of the gemstone.
“color panel|FAB25D”
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Topaz (noun)
A black Catholic soldier in the British Army.
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Topaz (adjective)
Of a yellowish-brown color, like that of the gemstone.
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Amethyst (noun)
A transparent purple variety of quartz, used as a gemstone.
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Amethyst (noun)
A purple colour.
“86608E”
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Amethyst (noun)
The purple tincture when emblazoning the arms of the English nobility.
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Amethyst (adjective)
Having a colour similar to that of the gemstone
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Topaz (noun)
a precious stone, typically colourless, yellow, or pale blue, consisting of an aluminium silicate that contains fluorine.
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Topaz (noun)
a dark yellow colour
“bright topaz eyes”
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Topaz (noun)
a large tropical American hummingbird with a yellowish throat and a long tail.
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Amethyst (noun)
a precious stone consisting of a violet or purple variety of quartz
“amethyst earrings”
“a delicate necklace of amethysts and pearls”
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Amethyst (noun)
a violet or purple colour
“an amethyst dress”