This is a beautiful Baltic Amber pendant - right from the capital of amber Gdansk / Danzig in Poland.
The pendant has no nickel or other substances causing most allergies making the silver hyper allergenic.
The size of the pendant - including the bail - is
3.9 x 1.8 cm or
1.54 x 0.71 inch
One of the pictures has a DIME coin to visualize the size.