Assertion: amethyst's color | /r/HasProperty | derived
Facets:
value: from heat treated amethyst
type: OTHER
Source sentences:
text: This is a really hot topic in the gem world, with some believing that the name Amethyst can only be applied to purple Quartz, others saying if a Quartz’s green color is derived from heat treated Amethyst then it should be named Green Amethyst and others saying it should be known as Green Quartz or Prasiolite.