What is the name of quartz or topaz that has a thin layer of gold deposited on its surface?

The name of quartz or topaz that has a thin layer of gold deposited on its surface is known as aqua aura. This term specifically refers to the process of treating quartz with gold to enhance its appearance and give it a distinctive shimmering effect. The treatment involves a vaporization method where gold is bonded to the surface of the quartz, resulting in a striking blue and gold multicolored stone that has gained popularity for its aesthetic qualities.

The other options refer to different types of stones or treatments. Gold quartz typically refers to quartz that contains natural inclusions of gold rather than being treated with gold. Topaz aura would imply a treatment involving topaz, but it is not a commonly recognized name in the same way as aqua aura. Golden topaz suggests a natural variation of topaz with a golden hue, which is distinct from the surface treatment that aqua aura represents. Thus, the correct answer appropriately identifies the specific treatment applied to quartz, distinguishing it from other similar terms in the gemstone nomenclature.