Thanks everyone for all of your excellent advice and help! I will plug away with these solutions and see if anything works!
If I figure it out, I'll post what the issue was and how I solved it for the benefit of the forum!
P.S., Tokei, I think you're right, as I can change the entry for my Green Gemstone within resnametable to the sprite name for Blue Gemstones, and I can right click my Green Gemstomes in game to see a Blue Gemstone graphic.
I used Photoshop, opened up the images for Blue Gemstones and simply adjusted the levels to make it Green. The Sprite looks great but I'm guessing I did save it as an invalid file type. Anyone have suggestions here, or possibly a could piece of software I could use to make my Green Gemstone. I'm really not that into Spriting and am much more into coding, so if anyone knows where I can just find a Green Gemstone sprite or if someone wants to make it for me, there would be even more appreciations to be shared! xP
P.P.S.,
I think you may have missed something in the first image. The Collection image is there as well as 'data/texture/À¯ÀúÀÎÅÍÆäÀ̽º/item/green_gemstone.bmp'.
Is that what happened? Or am I the one missing something, LOL