Скачать или смотреть Compute the Carat Weight of a Gem

This video shows how to compute the carat weight for a gem based on its shape (e.g. teardrop or oval), its dimensions and the type of gem (e.g. opal or rub). The calculation is made by a free on-line calcualtor found here: https://www.vcalc.com/wiki/KurtHeckma...
The gem shapes include round, teardrop, cabochon, cushion, heart shaped, emerald cut, long rectangular, navette, square, marquise and oval. The gems 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, Zircon.