Baltic amber stone with fossil inclusion - giant mite Acari, probably Erythraeidae.
It weighs 2.9 grams. Measurements of stone 23x23x9mm, length of mite body and head ~ 2.1mm, max ~ 4.8mm.
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.