No, all green amethysts are not synthetic but it is quite common to find heat-treated
amethyst due to the extremely limited availability of its natural form. To deal with its market demand, the low-quality
citrine and amethyst are often heat treated to produce green colored amethyst. So, it can be concluded that the stone is natural in origin which is later treated to enhance its color. On the other hand, synthetic green quartz stones are lab created but are marketed as green amethyst by scammy dealers. So, whether you want to buy green amethyst online or from any local store, it is always important to deal with only
trusted gem seller to avoid the chances of getting duped. At GemPundit, one can easily find a rich inventory of natural prasiolite (green amethyst) on sale along with authentic lab certificates.