Amethyst , Amethyst coloured, Amethyst Style
ByAntique dealers and auctioneers have a special ( an completely legal ) way of describing items when they are selling them to make them appear better than they really are. I am going to use three antique brooches to help show you what I mean.
This brooch below I am describing as being set with an amethyst. It means just that the stone is a real amethyst:

Amethyst Brooch
Here is Victorian Brooch with “Amethyst coloured stones”. This means they could be made of glass or an other imitation, they might be real ( they are not in this case). All I am describing here is the colour:

Amethyst coloured stones

Faux Amethyst
Other words to look out for when used in conjunction with the main word are Style, Type and Fashion. Look carefully at the next auction catalogue or internet site you read and you will spot this type of description quite frequently, its quite legitimate to use these terms and I do so myself . There must be many more similar words as well – can you think of any?

[...] Amethyst , Amethyst coloured, Amethyst Style [...]