This is an American cut art glass vase. The color of this glass is called Watermelon. The time period is from the American Elegant Glass, circa the 1920s through the 1930s.
Watermelon glass was made by American glassmakers in West Virginia and Pennsylvania, for example Cambridge Glass and the West Virginia Specialty Glass Company. I don’t know who the maker of this vase is. Not too much watermelon glass was produced, and it was only made in goblets, pitchers, sugar and creamers, and vases. What is found today in the antique marketplace is mostly the goblets. Vases are rare and scarce.
Watermelon glass shades from a green at the bottom to a pinkish hue at top, somewhat like rubina (rubena) verde, which is red-to-green.
This specific vase is an emerald green at the bottom and the color goes to what is considered a depression pink towards the neck, and the neck is entirely depression pink.
The glass is finely cut, ridged on the neck and down through the bulbous bottom. There are two horizontal cuts around the neck, and the glass is beveled where the horizontal cuts traverse the ridges. The rim is polished flat and beveled on the inside. The bottom is polished flat.
The vase is 7 7/8” high and 3 ½” wide at the belly.
There is a small glassmaking flaw on one ridge towards the bottom that I show in the last photo; I believe it is a burst air bubble and not a nick, however I may be wrong, so please look closely; it is small; there is another nick in the same general region, a few ridges to the left towards the bottom and it is mostly smooth, yet it can be seen with the eye. There is a little bit of estate residue on the bottom interior. The polished bottom shows scratches and wear due to age and a few nibbles along the edge. There are a few air bubbles.