1. Refractometer: A refractometer is a device used to measure the refractive index of a gemstone. It is used to identify the type of gemstone and to determine its authenticity.

2. Polariscope: A polariscope is a device used to detect the presence of inclusions in a gemstone. It is used to identify the type of gemstone and to determine its authenticity.

3. Spectroscope: A spectroscope is a device used to measure the spectral characteristics of a gemstone. It is used to identify the type of gemstone and to determine its authenticity.

4. Ultraviolet Lamp: An ultraviolet lamp is a device used to detect the presence of fluorescence in a gemstone. It is used to identify the type of gemstone and to determine its authenticity.

5. Microscope: A microscope is a device used to examine the surface of a gemstone. It is used to identify the type of gemstone and to determine its authenticity.

6. Specific Gravity Tester: A specific gravity tester is a device used to measure the density of a gemstone. It is used to identify the type of gemstone and to determine its authenticity.