| 1 | Chemistry of gemstones from vemireddipalle area, Krishna district, Andhra Pradesh, India |
| Researcher: | Sultana, Nazia |
| Guide: | Pitchaiah, P.Sankara |
| University: | Acharya Nagarjuna University, Guntur |
| Language: | English |
| 2 | Chemistry of silica gemstones from Bhatrupalem-Kolluru area, Guntur district, Andhra Pradesh, India |
| Researcher: | Mahamad, Shahabudden Sultan |
| Guide: | Pitchaiah, P. Sankara |
| University: | Acharya Nagarjuna University, Guntur |
| Language: | English |