This is called vaseline glass. It's got uranium in it to give it a yellow colour and so it glows under black light. It's a collector's item but you can often find inexpensive pieces on ebay under vaseline or uranium depression glass. It is NOT amber glass though, it is a much lighter shade of yellow than the amber depression glass. Just in case anyone wants to collect some for halloween or a party.
RH Modern's Blair Sconce:Matte-black hourglass shades cast light both upward and down in our Blair collection from American designer Aerin. Inspired by the tailored looks of 1950s lighting, it is a refined source of ambient illumination.