-In photographing some stones- it is the luminescence and refraction
that your camera is catching- the polarizer will assist in cutting
down ambient light not from the stone- but at a 1/2 to full stop of
aperature of focus depth which may afect the glimmer from the
-Try a simple light source from directly behind the stone- to show
I have used a white LED flashlight as a backsource- then cover the
stone with a greycard- and calibrate for your cameras own flash.
-It may take several shots- but the covered stone allows the camera
to light forward to showcase the necklace- and the spot behind the
stone allows for light radience through the stone- I know the
refractions within the stone are going to block some light- but
bracket your exposures.
-Use black velvet or similar soft fabric with a tiny hole for the
flash light to come through to mount the necklace on. Hope this
helps- In the advent it does not- find a local community college or
arts program and find out if the students want to take a crack at it
for a self-study or project- you may be amazed at the results and
student work comes cheap, and can build lasting partnerships for
-Be safe and enjoy the days!