Artisan created glass vessel sinks are, in fact, very sturdy. Virtually all professionally made glass sinks are resistant to small accident breakage, such as dropping a brush or plastic bottle into the basin. Of course a heavy object can break a glass sink. The rule of thumb is if something is heavy enough to break a glass sink, it would do the same thing to the common porcelain or enameled steel sink.
The most common problem we have seen over the years is not breakage after installation, but breakage before and during installation. There are two things that can cause this: 1) over-tightening of the drain assembly, and, 2) thermal shock.
Properly installing a drain means hand tightening only. Over-tightening with a wrench is not necessary and is the absolutely not recommended. In addition, the plumber or homeowner should use a bead of silicone during installation - or at least make sure that no metal contacts the glass. Most drains have gaskets that will prevent metal to glass contact.
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