Baltic amber stone with fossil inclusion - 2 prabably metallic wood-boring beetle larvaes Buprestidae.
It weighs 0.4 grams. Measurements of stone 16x11x4mm, length of larvaes ~ 3.5 - 4mm.
I can send digital high resolution picture by e-mail for personal (not commercial) use. Contact me concerning it.
If you which stone can be made into pendant for free. Please check if stone measurements are suitable for you.