One thing about turquoise is that there are natural turquoise pieces in jewelry and there’s stabilized turquoise. Stabilized is soaked in acrylic or epoxy resin and it will never really change color over 30 years or so. Natural turquoise will stay in most grades but with oils from our skin and handling, lotions, soaps, etc- natural turquoise will turn green over time. A kind of blah color. Natural turquoise also has natural inclusions like quartz and matrix - fake turquoise is usually dyed howlite so look howelite up and you’ll see what I mean. Peace
One thing about turquoise is that there are natural turquoise pieces in jewelry and there’s stabilized turquoise. Stabilized is soaked in acrylic or epoxy resin and it will never really change color over 30 years or so. Natural turquoise will stay in most grades but with oils from our skin and handling, lotions, soaps, etc- natural turquoise will turn green over time. A kind of blah color. Natural turquoise also has natural inclusions like quartz and matrix - fake turquoise is usually dyed howlite so look howelite up and you’ll see what I mean. Peace