Diamond Point Columns Vase, Fenton
Made from the original mold by Fenton. These have about a 4-inch base and range from around 14 to 16 1/2 inches tall. In amethyst, they sell on eBay for $20 to $25 although I've seen them go for as much as $57. A purple example sold at live auction in 2014 for $25.

In 2019, a 14-inch purple vase sold at auctiion for $20.

Updated 7/7/2019