These are Genuine Honey Baltic Amber post-back earings.  The Sterling Silver criss cross is above the Amber stone.

Amber (Bursztyn in Polish) is fossilized tree sap that dates back 40 million years.  It comes from all around the world, but the highest quality and richest deposits are found around the Baltic Sea.  During the colder months, when water density reaches its highest point, amber floats up from the seabed and is washed to shore by the waving sea. Amber is the only fossil resin that contains 3 to 8% succinic acid, a multi-purpose therapeutic substance, that was prescribed by early physicians for headaches, heart problems, arthritis and a variety of other ailments.  In ancient times it was carried by travellers for protection.  All of our amber is directly imported from the Baltic city of Gdansk, Poland.