Underwater tea ice

Does anyone know what brand the huge black and gold cocktail ring is worn by Olivia Palermo of 'The City'? - ring worn pictures

Unfortunately I could not for a photo, but it takes more time and the link below goes to a picture:

http://forum.purseblog.com/celebrity-bags-and-style/id-olivia-palermo-ring-442331.html.

any help would be great, thank you xx