About porcelain:

Some of my pieces appear fragile but actually fired porcelain is very hard material. On Mohs scale of hardness porcelain is 7 which is the hardness of most semiprecious stones as Quartz family (Amethyst, Citrine etc) or Garnets. It is much harder then glass (glass is 5,5) or silver (2.5).

Porcelain is fired on the temperature of 1240-1400C which makes it so durable and very well suited for jewellery.