Specific Gravity Testing Part 4: Refining Your Specific Gravity Testing Techniques
Step 3: Practical Gemology
Getting accurate readings when testing gemstone specific gravity is critical. If you make an error of 0.01 carats weighing a 10-carat gem, it will only affect the results by 0.03. That’s not significant. However, on a 1-carat stone, a 0.01 weight error will make a 0.08 difference in your specific gravity calculations. That’s enough to misidentify some stones. On a half-carat stone, the same error changes the specific gravity reading by 0.13. With smaller gems, errors lead to greater differences.
To help ensure maximum accuracy, follow these detailed procedures for …