How do I breed an Amethyst Dragon in DragonVale?

Interested in the fastest breeding combination for hatching an Amethyst Dragon? Well its February, so the new gemstone dragon is upon us. All the details are below - and note that if you want it, you're going to need a Hail Dragon, which some of you may not have bred yet. If the low breeding chance of Amethyst isn't enough punishment for you, try your hand and the recently released Cyclops Dragon. Also, don't forget that Panglong will be ending soon too.

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Breeding Pair: Hail + Sonic

Breeding Time: 28 hours or 22 hours 24 min (with upgrade)

Availability: February

Type: Gemstone

Price: 1,500 Gems (I think not)