Strange metal screw thingy with red gem cut object on end...Gauge light?

[j777extra]

Found this in my yard. Its a small screw in type object with male threads. Its silver colored metal, with a red gem cut type object in the end. Its only about 1/2" across and about 3/4" long. They used to work on cars at my house, so maybe some type of old car gauge light What is it?

 

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[mainer]

Maybe a shift indicator light from an old tachometer?

 

[taz42o]

They are called light jewels. Hard to tell exactly what it is off of.

 

[crazyjarhead]

They are called light jewels. Hard to tell exactly what it is off of.

You nailed it

 

[Jeep]

Yup, the were used on instrument panels, have some in the tool box for 24v systems on the trucks.

From the size of yours I would probably go with one off an amp though maybe like this one
from Fender:

http://www.drumza.com/product/Fender-Red-Jewel-Power-Indicator-Light-Cover.html

 

[j777extra]

I would say that this case is solved. Thanks everyone.