Is PhD an option for me or should I only consider double masters abroad for a Master's?

Yes, with your completed Master's in Geology and four years of work experience, you are eligible to pursue a PhD if you are interested in research or an academic career. PhD programs generally require a strong research proposal and a commitment to original research, which fits your profile.

A double master's abroad is another solid option if you want to broaden your expertise and gain international experience. This path is especially valuable for enhancing practical skills and expanding your professional network.

The best choice depends on your long-term career goals:
- PhD: Best if you want to focus on research or academia. - Double master's: Best if you want to gain practical skills and industry exposure.