Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: I want to do jewelry photography. Is this what I need to attach to my 58MM. telephoto zoom lens or should I buy a macro lens?
Document: If I eventually determine that Macro is something I enjoy and want to do more of, maybe at that time I'll upgrade to a dedicated macro lens. But until then, this is a fantastic alternative that lets me experiment with close-up photography at a variety of focal lengths. Recommended.
I purchased this close-up lens for several reasons, the most prominent being that (1) I'm just getting into close-up/macro photography and wanted a way to experiment with it, and (2) I'm not yet willing to drop serious money on a dedicated macro lens.
Sharp, well built, easy to carry when you don't want to bother with a macro lens. It is just as expected.
Although it is not cheap, compared to a true Macro Lens you can save anywhere from $300 to $800 which could be used for other gear. It is as good as a true Macro? No, but if you have a good Telephoto Lens to mount this on you can get razor sharp images as large as 16" x 20" which is excellent for the occasional Macro shooter.
This is a double element Filter which is unlike the single element. The single element is one lens that simply magnifies the subject, the dual element (as you guessed) has two elements where the second element does optical correction for the first making it more than a simple magnifying lens. The only thing I need to remind you of is that the dual element (or single for that matter) changes your focusing range.
I found this lens disappointing in it's usefulness. I find my Canon 60mm macro lens a far more useful, versatile and flexible lens.
Great addition to the canon 250 close up I have. I've used top dslr  macro lenses in the past so I have plenty of experience to compare the 500D to. No, you won't get the same quality as a true macro prime lens, but I was very pleased with the high quality I was able to achieve. It's also about knowing how to use your equipment. The best equipment will take terrible shots if the photographer doesn't have the knowledge to use it.
This is an excellent, affordable alternative to an expensive close-up lens for novice photographers such as me. I would recommend this.
If you do a lot of Macro work you'd be better served by a true macro Lens which would focus from, say, 10" to infinity.
Got this auxilliary lens for my Canon G1 X. Please note that for the G1X it requires the adapter ring. My only complaint is that it came without the pillow in the case that I am accustomed to getting with Canon lenses.
Answer: I use this item as part of my macro kit because I don't want to pay for or carry around a macro lens.  Having said that, I'm sure that there macro lenses out there that provide better magnification and possibly better image quality depending on the merit of whatever lens you use the 500D on.  If you put this on a high quality lens (Canon L glass, zeiss, etc.) you'll be thrilled with the result, put it on an inexpensive "kit" lens and you might not be so happy.  On a moderately good lens it should do well for jewelry photography.