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An Electronic Scale can be used to measure the specific gravity of gemstones and minerals, or any solid for that matter, including industrial materials. As with most hydrostatic devices, you simply weigh the stone "in air" and then weigh it in water. A typical scale intended for such purpose has a "weigh below" hook on the underside of the scale from which to suspend a "gem holder" in a container of water. While this works for a weighing of the stone in water, it is an awkward operation - the scale must be elevated on a stack of books or the like, and the user must work in a confined space underneath it.
Mineralab has, instead, developed a very user-friendly "above the scale" underwater weighing process, along with a Universal Specific Gravity Kit (see photo above). Just weigh the stone "in air" on the integrated weighing platform of the scale, then without changing any setup, weigh the stone in water by placing it in the underwater weighing pan suspended above the platform. Then plug those two values into the Specific Gravity equation to obtain the specific gravity of your material. It's that easy and it takes only a few seconds! See our YouTube video below:
The photo above shows the components of our Universal Specific Gravity Kit, and how it is utilized with an Electronic Scale. A beaker of water sits within a spill-resistant support independent of the scale itself, while a lightweight Underwater Weighing Pan assembly rests on the scale's weighing platform, with the weighing pan suspended underwater. The components of our Specific Gravity Kit include the following:
This version of our Universal Specific Gravity Kit can be used with virtually any Bench or Lab size Electronic scale, provided that:
For those who need accurate specific gravity measurements on small, lightweight gemstones, these further criteria are necessary:
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