Step 3: Practical Gemology

Lesson 9

You can use an electronic scale for calculating specific gravity if you have the right accessory, a hanging basket for measuring the weight of gems in water. We’ll take you through the testing process step-by-step.

Step 1: The Equipment

Step 2: Measuring Dry Weight

Step 3. Measuring Weight in Water

Step 4: Calculating Specific Gravity

The formula for calculating the specific gravity of a gem is:

Calculating specific gravity - formula

You can purchase electronic scales for calculating specific gravity through Amazon or eBay.

The 5-Part Specific Gravity Testing Series

Definitions (Part 1)

Using a Balance Scale or a Hanneman Specific Gravity Scale (Part 2)

Calculating Specific Gravity With An Electronic Scale (Part 3)

Refining Your Specific Gravity Testing Techniques (Part 4)

Using Heavy Liquids (Part 5)