Tom Stoenner art glass vase. 1996- purchased from Barneys NY Madison Avenue

  

From Claude (AI for problem solvers) I can identify this piece with reasonable confidence. Tom Stoenner, hand-blown art glass vase (Hudson Valley, NY studio glassblower).

The style is a great match: the pulled-feather/king's-tut design in iridescent blue-teal luster, the swirling combed pattern, and the "robin's egg blue" iridescent surface are all hallmarks of his work - he's known for steeping glass in jewel tones over a solid ground color and pulling feather patterns while hot. A few supporting details from your photos. The signature scratched into the pontil on the base is consistent with how Stoenner signs his pieces by hand.

The applied clear glass "feet" (prunts/bubbles) around the base pontil area are a decorative touch seen in his work. Alder, which lines up with your caption.