Baltic amber stone with fossil inclusion - extremely rare aquatic whirligig beetle Gyrinidae, Gyrinus.
It weighs 0.4 grams. Measurements of stone 17x12x3mm, length of insect body and head ~ 4.2mm.
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.