Gem - Navette or Boat-shaped

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Equation / Last modified by KurtHeckman on 2018/03/13 17:01
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KurtHeckman.Gem - Navette or Boat-shaped

The Weight of a Navette or Boat-shaped Gem calculator Navette.pngcomputes the approximate carat weight of a Navette or Boat-shaped colored stone (e.g. Ruby).

INSTRUCTIONS: Choose units and enter the following:

  • (GEM) a choice of the type of gem
  • (L) the length of the gem
  • (W) the width of the gem
  • (D) the depth of the gems
  • (B) a pad of the weight with a percentage for any central bulge

Navette Cut Gem Weight (Wt): The calculator returns the weight in carats.  However this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

The weight of a navette cut gem is a function the volume and the specific gravity.  The volume is estimated base on the gem's shape and dimensions.  The specific gravity is dictated by the type of gem.  For the specific gravity of different gem, CLICK HERE.  

Gem Types

The gems supported in this calculator include: Agate, Alexandrite, Almandite garnet, Amethyst, Andalusite, Aquamarine, Beryl, Bloodstone, Blue Topaz, Carnelian, Cats eye, Chalcedony, Chrysoberyl, Citrine, Corundum, Demantoid Garnet, Diamond, Emerald, Golden beryl, Green beryl, Kunzite, Lapis Lazuli, Morganite, Onyx, Opal, Precious topaz, Pyrope garnet, Quartz, Rhodolite garnet, Rose Quartz, Ruby, Sapphire, Sardonyx, Smokey quartz, Spessartite garnet, Spinel, Tanzanite, Topaz, Tourmaline, Tsavorite garnet, Turquoise, Yellow topaz, and Zircon

Other Gem Cuts

Gem weight calculators: AllCuts.png  Gem Cuts