Not for actual jade inspection, but for other uses - closeup work, illuminating small holes, etc.
Does the head shape help make the beam better? (besides eliminating spill)
Does the warm tint help for closeup work?
Cheap examples:
18650 warm - http://www.buyincoins.com/details/cree-180lm-led-18650-flashlight-jade-expert-warm-white-product-4632.html
18650 cold - http://www.buyincoins.com/details/cree-180lm-led-light-flashlight-18650-jade-expert-white-product-4633.html
AA/14500 not sure warm/cold, stupid modes (and I wouldn't trust FP about the emitter type) - http://www.focalprice.com/LFD84B/Tank007_TK568_CREE_XRE_Q4_1Mode_LED_Flashlight_Torch_Black.html?SSAID=447047