Islamic Seal?

[taube]

Gents,

got this brooch (?) at a local store.
My research leads me to the conclusion that it may be a seal made from Carnelian.
Finer examples can be found here:
here http://www.anahitagallery.com/islami...amps-and-seals

Can anybody transcribe/translate the writing on my example?

Any ideas on the backside fittings?

Thanks in advance,
taube.