What does the term 'precious topaz' refer to?

The term 'precious topaz' specifically refers to a trade term designated for orange-to-yellow and brown topaz. These colors are considered more desirable and have a higher value in the gemstone market, making them classified as "precious." Unlike more common varieties of topaz, which can come in a wider range of colors, this designation highlights the specific hues that are particularly sought after.

Additionally, the classification of topaz into "precious" and "semiprecious" categories is important in the gemstone industry, as it influences market pricing and consumer perceptions of the stone's value. While pink and red topaz is considered valuable, it doesn't fall under the 'precious topaz' designation. Similarly, the options regarding a specific type found only in Brazil or synthetic stones do not align with the widely accepted trade definitions in the gemstone market.