Topaz blue gemstone

Blue topaz is a valuable variety of the mineral species topaz, known for its color ranging from light to deep blue, mainly achieved through heat treatment or radiation exposure.

About this subject

Blue topaz is one of the most popular gemstones in the jewelry market, especially after the development of enhancement techniques in the 1970s. Naturally, topaz is usually colorless, pale yellow, or brown; blue color rarely occurs in nature. The vast majority of commercial blue topaz is obtained through heat treatment of colorless topaz, often combined with irradiation, resulting in shades like "Sky Blue," "Swiss Blue," and "London Blue." London Blue is the darkest and most valued. The world's leading producer of topaz is Brazil, with important mines in Ouro Preto (MG), Itinga (MG), and the Cruzeiro region (SP). The topaz crystal has a hardness of 8 on the Mohs scale, making it the hardest silicate, second only to corundum (9) and diamond (10). The name "topaz" has uncertain origin, possibly from Greek "topazos" or Sanskrit "tapas" (fire). In India, blue topaz is believed to promote calmness and communication. It is the birthstone for November, alongside citrine.

Frequently Asked Questions

Is blue topaz found naturally in blue color?

It is extremely rare. Most commercial blue topaz is produced by heat treatment and irradiation of colorless or light-colored topaz.

What are the main types of blue topaz?

The main types are: Sky Blue (light blue), Swiss Blue (medium intense blue), and London Blue (deep dark blue).

Is blue topaz suitable for everyday wear in rings?

Yes, with hardness 8 it is durable, but should be protected from hard impacts due to its perfect cleavage which can cause fractures.