Ghule
Ghule is a series of scripted items that interact with each other. They were most recently sold at Goblyns and Ghules Enterprises (also known as the Smuggling Tunnels) at Ebon Gate 2015.
Some information from GSGuide.
Crystal Rings
These rings were sold at Goblyns and Ghules Enterprises at Ebon Gate.
Analyze
You analyze your black opal ring and sense that the item is largely free from merchant alteration restrictions, but the creator has stated that "The item type should not change."
The creator has also provided the following information: You get the sense that this ring can be altered, though there are some restrictions. Any merchant can change its base and long description, but it must remain a ring of some kind. The only elements of its showy description that can be altered are the material of the ring, as well as the color of light that the gem on it is giving off.
Currently you are able to STARE/PEER/GAZE at the ring. This ring may be unlocked further (to allow for more color options) within special, rare circumstances.
You can tell that the ring is as light as it can get.
Tier 1
look (presumably): Inset into the simple, polished black opal ring is a faceted crystalline gem. The gem glows with a misty silver light.
peer: You raise your hand up in front of you and stare into the crystalline gem inset upon your polished black opal ring. As the gem catches the light, you suppress a shudder, and the world momentarily takes on a misty silver hue.
stare: You raise your hand up in front of you and stare into the crystalline gem inset upon your polished black opal ring. As the gem catches the light, you suppress a shudder, and the world momentarily takes on a misty silver hue.
gaze: You raise your hand up in front of you and stare into the crystalline gem inset upon your polished black opal ring. As the gem catches the light, you suppress a shudder, and the world momentarily takes on a misty silver hue.