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Is the black aurora crystal collectible?
Yes

The evaluation of the collection value of black crystal is mainly based on its color, transparency, size, clarity, special pattern and whether it has optical effect. It is best to have pure color, high concentration and flawless interior. Black crystal with special optical effect has higher collection value. Generally speaking, amethyst and topaz are varieties with high collection value among black crystals. The further classification of the two is based on the depth of their colors. The darker color is Grade A, and the lighter color is Grade B ... Generally, the series with darker color has higher value, but it should be based on non-darkness. There are two colors, one is the color of the black crystal itself, and the other is the color of the internal contents. The color of the black crystal itself should be bright and pure, and the distribution should be even, not too deep or too shallow, such as Australian jade, blue chalcedony, amethyst, yellow-black crystal, etc., which has high collection value. Colorless black crystals contain colored inclusions, and also have high collection value, such as titanium crystals, green ghosts, red rabbit hair and so on. Violet-black crystals are generally top-grade, slightly cloudy, with deep purple color and transparent crystals.