

An in-depth systematic corundum gemstone identification course focusing on professional identification and evaluation of rubies and sapphires. Learn gemstone characteristics from major origins including Myanmar, Sri Lanka and Mozambique, master detection techniques for treatments such as heat treatment and diffusion, understand color grading, clarity assessment and market pricing strategies to become an authoritative expert in corundum gemstones.

In-depth study of corundum chemical composition, crystal structure, physical properties and optical characteristics, understand color-causing mechanisms of rubies and sapphires.
Learn gemstone characteristics and inclusion identification of major ruby origins including Myanmar, Mozambique, Thailand and Madagascar.
Learn identification features and determination techniques of famous sapphire origins including Kashmir, Myanmar, Sri Lanka and Madagascar.
In-depth research on various inclusions in rubies and sapphires, master the importance of mineral inclusions and liquid inclusions for origin determination.
Learn identification and detection techniques for heat treatment, beryllium diffusion, iron and titanium diffusion and other treatments of rubies and sapphires.
Master characteristic identification and determination methods for flame fusion, hydrothermal and flux-grown synthetic rubies and sapphires.
Learn international ruby and sapphire color grading standards, master evaluation methods for top colors like pigeon blood red, royal blue, cornflower blue and market value assessment.
Upon successful completion of this course, you will receive a GUILD certificate recognized by leading gemological institutions, laboratories, and jewelry houses worldwide.

At GUILD, I discovered that pearls are more than jewelry—they’re a cross-cultural art form. The program made me more confident and professional in sharing their beauty.
GUILD has a strong team of instructors who are very patient, and the quality of the classes is guaranteed. In addition to theoretical learning, a lot of time is devoted to hands-on practice, which I really enjoy.
The immersive experience of on-site learning is very strong. I really enjoy the “learn-and-practice” approach, which allows me to turn what I’ve learned into practical experience. This opportunity to study at gemstone mining sites has given me a deeper understanding of the gem industry.
Can't find what you're looking for? Contact our admissions team for personalized assistance.
Contact UsWe maintain small class sizes of maximum 20 students to ensure personalized attention. The student-to-instructor ratio is approximately 8:1, allowing for hands-on guidance and individualized feedback.
No, all laboratory equipment, instruments, and gemstone samples are provided.
Yes, GUILD diplomas are recognized worldwide. Our graduates covers various fields.

Secure your spot in this exceptional gemology program and take the next step in your professional journey.