The bottom of a cut crystal bowl (blue and clear glass), held up to the sky so the light shone through at a bit of an angle to accentuate the cuts. I like the pattern and color and lighting. Really, pretty happy with how this one turned out.
Had the 20mm extension tube on.
Blew out some highlights with processing but I kind of like them that way.
PP - converted from RAW, white balance, cropped, cloned/healed all sorts of spots that looked like sensor dust and/or blatant flaws in the glass that went against the grain of the pattern, increased contrast, burnt edges where blue and clear met, desaturated all but blue and hand desaturated on nominally clear bits, resized, sharpened, added border, healed a few more scratches.
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this is a good idea...IMO I probably would have done some additional reduce noise work...making some of your lines a bit smoother and softer...but a good job none the less