Ok, well that would definitely be easy enough to do.
What you want to do is get yourself an imitation gold leaf kit. That will come with the size that you need as well as a clear coat and some imitation gold leaf sheets. You CAN use 22K gold leaf if you really want to... depends on how many commas you have in your bank account
PRACTICE ON SOMETHING ELSE FIRST!
Then when you know what you are doing, do it on the saber.
Make sure you wear gloves when you handle the leaf or you will get finger oils on it and it either won't stick, it will discolor, or it will reject the clear coat.
Tape off between all the little groves and ridges so you don't wind up getting it everywere and just leave the silver bits exposed. Put on the THINNEST POSSIBLE coat of size using the softest finest brush you can get your hands on. Once it has dried to the point of being tacky to the touch without still coming off on your hands (use the back of your knuckle to test it, do NOT touch it with your fingertips) you take your gold leaf and press it on. Try and do as much of it in one go as possible. It will ONLY stick where you have painted the size, so don't worry about where it lands yet, you can clean it up later. Rub it on very gently with a soft cotton cloth, or put on some cotton gloves and rub very gently with your fingertips. This is where it will get a bit fiddly with those dips in the emitter, and that deep section under the base of the emitter. Just go slow and steady and make sure every part is covered. Don't worry if some bits got missed, you can add more size to them later and apply more leaf then.
Let the gold leaf sit on the size for about 30-45 minutes after you have stuck it down before you do any more. Once it's been sitting for a while, tear off the excess parts of the leaf sheets (keep them for another project or a second coat in case some didn't stick in little parts that you missed putting size on) Then pat it down firmly with your cotton cloth.
Using a GOOD QUALITY spray on acrylic high gloss clear coat, cover the entire saber in an even coat of clear. Don't go too heavy or it will run, and don't go too light or it will dry as you apply it and go matte instead of gloss. After the stated dry time for the particular clear you have, feel it and see if you are happy with the finish. If you need to get it smoother, get some 2000 grit or higher sandpaper, sand it every so lightly to remove the fuzzy feeling, then apply another coat. Continue sanding and coating until you have the shine you want or as many coats as you want of clear as you want. The more layers you do, the better, as you can give it a buff to bring out the shine even more if you have a nice thick clear over your finished project.
Feel free to ask any other questions if you have them, but except for the emitter, it should be a pretty simple process. Good luck, and share some pics. I had tossed up on gold leaf, but didn't want to fiddle with it on something so small. But I am wanting to do a chrome leaf saber, so I'd love to see how yours turns out