Архиви на етикети: What is the discoloration of gemstones during wax setting?

Дизайн на сребърни бретончета какво е обезцветяването на скъпоценните камъни по време на восъчна настройка?

The first situation occurs mainly because some gemstones are not suitable for wax setting casting. Gemstones with developed fissures are likely to change color after being subjected to high temperature and thermal shock. Some gems (като Аметист, blue topaz, цитрин, и т.н.) are unstable in color when exposed to heat, so this type of gem […]