Cut and polishing are important factors in gemstone quality. The cutter must judge from the rough stone what would be the best shape for this particular stone, considering the inclusions. The cut can also be affected by whether to maximize carat weight or brilliance. Maximized brilliance often means lower carats.
Gemstone cutting requires substantial professional skill and experience. Myanmar has been closed for international trade for decades and suffered from lack of education and investment. Much of Myanmar’s top quality rough stones have been exported to other countries for cutting. However, the local cutters are skilled and able to produce good quality gemstones. All gemstone used by MyDesign are cut and polished in Myanmar, in order to provide higher value add in the source country.
Key factors to keep in mind:
- Faceted cut gemstones come in myriad of shapes each with a number of facets. Shape can be round (majority), oval, cushion, emerald, pear, marquise, banquette etc.
- Cabochon cut has a rounded top and a smooth, polished surface with a flat back. This cut is typically used for gemstones that are opaque, translucent or strongly colored. Star (Star-Ruby or Star-Sapphire) or cat’s eye are on visible on cabochon cut.
- Brilliance is the brightness of light reflected from inside the gem (result of mineral refractive index and quality of cut – light enters through table and reflects back from pavilion facets)
- Luster is a sheen or glow reflected from the gem’s surface.
Simplified outcome of cut and polishing (Gemval.com standard):
- Excellent – ideal proportions and symmetry, excellent polishing, exceptional brilliance/luster
- Good – balanced, symmetrical form, minimal facet misalignment, small or invisible marks, good brilliance/luster
- Poor – unsymmetrical or disproportional form, facet misalignment, noticeable polishing marks, poor surface luster or an overly dark stone