Amethyst and sea foam sea glass are two of my favorite colors. They look lovely together.
Purple (Amethyst) Sea Glass
Purple or amethyst sea glass comes from mostly clear glass that contains manganese. After the clear glass has been exposed to the sun, manganese oxidizes to a faint, purple hue. Depression glassware and other glass containers come in purple too.
If you’ve found purple sea glass, consider yourself lucky. It’s quite rare.
Sea Foam (Light Green) Sea Glass
Sea foam or light green sea glass comes mostly from soda and beer bottles. It’s not as rare as purple sea glass, but it’s still a nice find.