Open at home gemstone Tray Oysters

What's inside could be..

Swiss Blue Topaz
Citrine
Sapphire
Onyx
Ruby
Black onyx
Garnet
Fluorite
Green Agate
Blue agate
Yellow agate
Tigers eye
Chalcedony
White topaz
Peridot
London Blue topaz
Tourmaline
Sandy quartz
Sky blue topaz
Royal blue topaz
Moonstone
Amethyst
Aquamarine
Opal
Green Topaz