Normally, 3D hard gold can be determined by the presence of a small hole inside the bracelet. If there is a hole, the bracelet is hollow. If not, it is solid.
With 3D hard gold, very light grams can be made into very large hollow volume shapes.
For example, if a gold bracelet is solid gold, it may weigh ten or even tens of grams, while the 3D hard gold is hollow and only weighs one or two grams.
Most 3D hard gold bracelets will be made of hollow materials, but it may be possible to re-create solid materials. The best way to do this is to look directly at the inside of the bracelet for holes that have been poured.
In a way, 3D hard gold is the best choice for hollow bracelets for everyday wear. 3D hard gold overcomes the biggest drawback of hollow gold bracelets, which is that if they are deformed or dented, there is no way to repair them.
3D hard gold, though hollow, is much harder and lasts longer than solid gold bracelets, and is less likely to deform.
3D hard gold bracelets on the market today are mainly hollow.
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