Can Blue Topaz Be Worn Every Day? Durability: Durability is the most important factor in deciding whether Blue Topaz crystal can be worn every day or not, as blue topaz possesses good hardness, ranging from 8 on the Mohs hardness scale. This makes the gemstone suitable for everyday wear, but it's important to remember that even though it is hard, it can still have a chance of damage. Everyday jewelry pieces like rings and bracelets expose the gemstone to potential knocks and scratches.