Here is a lovely chart of the Mohs scale which should always be considered when buying a gem. Aquamrine and other beryl’s are somewhere around 7 and let us just say that Opal is far softer at around 5.5. It is important to note the hardness of these gems because when dropping a piece off for cleaning, a customer should have an understanding of any risk that can come from regular maintenance, even with the best bench jeweler.
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