Based on the word "topaz", the extra "z" makes this flexible domain stand out from the crowd.
Topazz has only six characters and just two syllables. Two-syllable names are extremely rare and highly prestigious. Successful brands using two syllable names include Disney, Ikea and FedEx.
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 desirable top-level-domain in the world, famously used by websites like twitter.com. When most people think of a website, they think of a dot com.