Is PhD worth it when considering your career in industry

You haven't really defined what you mean by "...when considering your career" in the subject of this post. On the one hand, you say,

I would like to deepen my understanding on my field.

If your goal is to deepen your understanding, one way to do that is to get a PhD. You can also do this on your own, without getting a PhD, but you'll find a more structured path and (possibly) more resources if you go down the PhD route.

On the other hand, you say,

I am interested for a career on industry.

Are you interested in industry because of the money? If that is the case, you're most likely better off earning a full income and "moving up the ladder" during the time you would spend in graduate school, which means you should forego getting a PhD to concentrate on the money.

If you're interested in a career in industry because of reasons outside of financial considerations, then you have to think about what kinds of jobs you're looking to take in industry. If you're satisfied that your current skills and educational level will make you competitive for the jobs you want, you should probably reconsider the PhD, and to "deepen your understanding" in a different way. Then again, a certain percentage of people want to get a PhD for the challenge and for strictly personal reasons, removed from the job details themselves.

If the jobs you want to get are generally given to PhDs, then you have your answer already -- get the PhD to make yourself competitive for those positions.

I suggest writing down all of your long-term goals, and then weighing them against the time and cost (and opportunity costs) of getting your PhD. If after all that you still don't have a good answer, you might consider continuing with your program for another year and just postponing the decision until then. Eventually, either you will get your PhD, or you will be convinced that it is better off that you stop the program (but the decision may get harder the closer you are to finishing).

It is impossible to answer your question unless you tell in which country you intend to work in the industry.

In France, for example, a PhD is not very highly considered by industry, where the one important criteria is which engineering school you did. This is slowly evolving.

I heard that in Germany, a PhD is highly valued in industry, even if its content has nothing to do with the job.

I have little knowledge for other countries.

I completed my PhD recently and I am currently working in the industry. Mine is a PhD in CS and my thesis was on development of newer techniques for real time prediction. Before PhD, I had 5 years of work experience in the analytics sector. Personally, I found the entire experience of the PhD to be intellectually satisfying and worth the effort. Yes, I had to forgo 4 years of income or earning opportunities and survived on an adequate stipend. But I believe PhD in a technical field like Machine Learning will always be in demand in the industry. Post PhD, I got the job as a data scientist with the largest online retailer. I think it varies from individual to individual and one should find their own way. In my country, PhD is not that highly valued in the industry. But I guess one should do a PhD in an area for which they have some passion so that they can develop the skill sets that will make them competitive in the job market.