Baltic amber stone with fossil insect - well preserved great fungus gnat Mycetophilidae, probably Synapha.
It weighs 2.9 grams. Measurements of stone 21x19x12mm, length of insect max ~ 7mm, body and head ~ 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.