An ultrasonic jewelry cleaner does exactly what its name suggests, it cleans jewelry! Jewelry is cleaned by vibrating items at a high frequency while immersed in a cleaning solution. The high vibration dislodges dirt and grime from the jewelry.
The Tiffany head was designed by Louis Tiffany (yes, that Tiffany). At the time Tiffany developed the Tiffany head, other jewelers were surrounding diamonds with more metal to hold the gem in place. Often, the diamond became overwhelmed by the boxed in type settings.
On a tapered head the prongs taper downward and inward, following the contour of the gemstone. Often the gemstone is set higher and seen from above, appears to float. The tapered head gives the ring a feeling of lightness and femininity.
Synthetic gems have all the chemical and physical properties of natural ones but are created in a laboratory. This is not to be confused with simulated gemstones, which only mimic the visual look of real gemstones.