One thing that maybe could help you is that all the designs including the artifacts in the Temple of Serpent have an "art-nouveau" style. You will find some comparisons in the pages of the "historical art and symbolism" thread.
I find the stand of the jewel like some kind of metallic-maybe iron-, "art nouveau" object" pretty close to these two pictures:
These are real historical pieces from museums or private collectors
In Salamanca (Spain) there is an Art-Nouveau museum, very interesting. You will find lots of similarities with Ron Cobb and William Stout style.
You can watch some of the objects here:
Of course, man, authentic "art nouveau" objects would be really expensive and hard to find, but if you are open to spend some money and make a search, maybe you could find some nice serpent motifs like these two made in iron.
And maybe you can find some cheap reproduction or something, I don't know. You can even order it to be built in some jewels shop, or in some art shop.
Also, take a look in some antiques shop, and maybe you can find some iron serpents. In Spain these shops are very common in some cities, I don't know in your country.