An Unmounted Amber,
the oval orangy/yellow panel, stated to measure 15 mm.

Stated by owner to include a "fossil" inclusion presumably an insect and originally of Dominican Republic origin.

Footnote:Dominican amber is amber from the Dominican Republic derived from resin of the extinct tree Hymenaea protera.Dominican amber differentiates itself from Baltic amber by being nearly always transparent, and it has a higher number of fossil inclusions. This has enabled the detailed reconstruction of the ecosystem of a long-vanished tropical forest. (source:Wikipedia)