'Aura' quartz crystals are made by electroplating gold, titanium or other precious metals onto the surface of regular clear quartz crystals in a vacuum, creating a wide variety of unusual colours (not all are pictured here). This microscopic coating is only on the surface of the crystal - the inside still remains colourless but visible through the coloured tint.
They are frequently named for a metaphysical association with the resulting colour.
1. Natural clear quartz
A clear, natural, colourless quartz crystal.
2. Natural tangerine quartz crystal
Sometimes metal (particularly iron or chromium) oxides can be deposited on the surface of a quartz crystal, tinting it to appear a different colour. This crystal has a natural coating of iron oxide - chemically, rust - giving it an orange tint that is a bit streaky and uneven in appearance when looked at closely.
3. 'Tangerine Aura' /'Imperial Gold aura'
These are a clear quartz crystal and carved shapes that have been coated with gold and iron oxide. The coating is a lot more even than the streaky look of the natural tangerine quartz crystal in (2.).
4. 'Opal aura'/ 'Angel' aura/ 'Rainbow aura'
These have been coated with platinum and silver, creating an iridescent chrome-like coating. The name 'Rainbow aura' is also used to refer to another form of aura quartz that is dark and seemingly opaque (shown as #7)
5. 'Tanzan aura'/ 'Indigo aura'
Not to be confused with Tanzanite, these are coated with gold and indium, appearing a deep blue.
6. 'Aqua aura'
This is one of the first aura crystals to reach the market - coated with gold.
7. 'Flame aura'/'Titanium aura'/'Flame titanium aura'/'Rainbow aura'/'Dark aura'
Dark, seemingly opaque but strongly iridescent, coated with titanium and niobium
Also not pictured are:
- 'Champagne aura' (Pale brown with iridescence, also coated with gold and indium)
- 'Ruby aura' (Brilliant pink or red, coated with a varying combination of metals including gold)
One advantage, besides creating a preferred colour, of these expensive treatments is that crystals that are coated in this way usually need to be very clear and free of flaws that would cause it to crack during the process, so they tend to be more durable for the average buyer. They almost always cost 10x more than natural, unaltered quartz crystals.
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