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Calcimator

Gemstone Density Calculator

Calculate specific gravity from hydrostatic weighing (weight in air and water) for gem identification.

Inputs

ct
ct

Results

Specific Gravity

3.52

Density3.52 g/cm³
Possible GemsDiamond, Topaz
Volume1.42 cm³
How to Use This Calculator
  1. Place the gemstone on a precision scale and record the Weight in Air in carats.
  2. Suspend the stone in distilled water using a thin wire and record the Weight in Water.
  3. Review the calculated Specific Gravity — diamond is 3.52, ruby 3.99, emerald 2.72.
  4. Check the list of Possible Gem Matches for stones with similar specific gravity values.
  5. Use the Volume in cm³ to cross-check carat weight estimates for mounted stones.

How the result changes with Weight in Air

Weight in AirSpecific Gravity
501.08
1751.02
3251.01
4501.01

What each input means

Weight in Air
Gemstone weight measured in air (carats or grams)
Weight in Water
Gemstone weight measured submerged in water

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Weight in Air = 5, Weight in Water = 3.58 = 2 input(s) provided
  2. Calculate Specific Gravity
    Specific Gravity
    3.521 = 3.521
  3. Calculate Density
    Density
    3.521 = 3.521
  4. Calculate Possible Gems
    Possible Gems
    Diamond, Topaz = Diamond, Topaz

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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