Glass Vase Blue Iridized

Glass vase in a beautiful iridized periwinkle blue color.
The vased is ribbed.
It is 11" tall.
No chips or cracks.
There are some grayish staining just under the lip of the rim possibly part of the glass?
There are water spots that formed an iridescent patina to the vase.
The inside bottom of the vase will need some cleaning.