Coated Quartz (Aura Quartz): Treatment, Metals, and Labeling in Retail

What is Aura Quartz?

Aura Quartz (also known as Coated Quartz) is natural rock crystal (SiO₂) whose surface has been finished with an ultra-thin layer of metal. Common trade names include Angel Aura, Aqua Aura, Rainbow Aura, and Titanium Aura.

Important: The quartz itself remains in its natural state - only the surface is treated. The iridescent colors are created exclusively by the metallic coating.

How is the coating created?

Aura quartz is produced using modern vacuum technology:

Selection of natural quartz crystals

1. Thorough cleaning
2. Placement in a vacuum chamber
3. Evaporation of metals at high temperature
4. Deposition of metal atoms on the surface (PVD/CVD process)
5. Cooling and finishing
The coating is only a few nanometers thick and bonds permanently with the crystal surface.

Which metals are used?

Different metals are used depending on the variant:

Angel Aura

Metals: Gold or gold + platinum

Effect: Delicate, pastel-colored rainbow shimmers

Aqua Aura

Metal: Gold

Effect: Bright, intense blue

Rainbow Aura (Mystic Aura)

Metals: Titanium, often combined with niobium

Sometimes: Gold, silver, or platinum (in trace amounts)

Effect: Strong, rainbow-like color play

Titanium Aura, Titanium Quartz 

Metal: Titanium

Effect: Metallic iridescent, intense colors

Note: There is no standardized formula. Manufacturers vary metal combinations and coating thicknesses.

Why does Aura Quartz shimmer in rainbow colors?

The colors are created by thin-film interference: Light is reflected at different interfaces and overlaps. This creates iridescent color effects – similar to soap bubbles or oil on water.

Durability & Care

Aura Quartz is stable but should be handled gently:

+ No harsh cleaning agents

+ No ultrasonic cleaning

+ Not suitable for soldering

+ Ideal for pendants, collectibles, and jewelry with low wear and tear

Declaration in Retail

For sales purposes, correct labeling is important: Recommended trade name: "Coated Rock Crystal (Aura Quartz)"

This clearly communicates that it is a natural mineral with a surface treatment.