Finally I can be the expert!
though I am working towards being a full-time jeweler, my day job is
being a graphic designer. And what do I do %50 of the time?... colour
ok - this is a little complicated so please ask me to elaborate if
you need me to, and I'm going to guess at what you would need to do
to help out these pictures...
1 scan them in at around 300 dpi at actual size or print size
2 convert your file to Image/mode/CMYK
3 in the layers palette there are "adjustment layers" (the little
black/white circle) from this menu I want you to pick "curves" here
you can take out all colours or each individual colour and it
enables you to isolate where you want to take it from (highlights,
midtones, lowlights) by grabbing the points at either end or starting
one in the middle I'm guessing you need to take a bit out of your
highlights and/or midtones to brighten up the diamond
this is a little tricky and you will need to play around with it a
at this point you just want to concentrate on the diamond because
you may have to adjust each element in the image individually ie.
stone, metal, background) you can do this by adding a mask to any
adjustment layer - make a selection and click on the little camera at
the bottom of the palette
HAVE I LOST YOU YET?
4 once you think you have the colour balance right you are either
done - or you can add an adjustment layer of "brightness/contrast" a
little goes a long way
GASP! ok so I hope you understand that...