Based on the word "topaz", the extra "z" makes this flexible domain stand out from the crowd.
The word "topazz" contains only six characters and only two syllables. Two-syllable names are extremely rare and highly prestigious. Two syllable names are used by established brands like Walgreens, Pocket and Sony.
This domain was first registered in January 2002. Older domains have an advantage when ranking in search engines.
Topazz.com is a dot com domain. Dot com domains are the most valued domain extension in the world, famously used by websites like google.com. A dot com is the first thing people think of when they think of a website.