The Weight of a Navette or Boat-shaped Gem calculator computes the approximate carat weight of a Navette or Boat-shaped colored stone (e.g. Ruby).
INSTRUCTIONS: Choose units and enter the following:
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 CLICK HERE.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,
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