The most common blue colorless topaz on the market. In particular, Swiss blue is easily confused with aquamarine, and transparent glass is often used as an imitation of colorless topaz. Yellow topaz is often confused with yellow crystal.

The appearance of aquamarine is very similar to topaz, but the market price gap between them is very big, so it is safer to find a reputable merchant to buy it. In topaz, obvious color bands can often be seen by light transmission observation, but in topaz, there are few color bands. Glass imitations are very pure in texture, while natural topaz generally has defects or crystal inclusions.

Most of the blue topaz sold in the market is produced by irradiation of colorless topaz. However, it is usually kept for more than six months, and the gems are sold after the complete half-life and the radioactive materials are degraded and have no radioactivity. This is an acceptable treatment method for the jewelry industry all over the world.

Some pink Huang Yushi is formed by heating pale yellow Huang Yushi. These Huang Yushi have been heated for centuries. Some pink Huang Yushi inlaid in medieval antique jewelry was heated. Because the color of this treatment is long-lasting and stable, it is recognized and accepted by the jewelry industry, and it is not necessary to investigate whether pink is natural or the result of heating.

I hope the answer can help you.