Hi Frederick,

Thank you for contacting Mearto with your appraisal inquiry.
This is likely something that was picked up in Italy during someone's Grand Tour - a seminal event in a wealthy young man's education when they would travel throughout Europe to complete their "education." Souvenirs from those travels are now referred to as "Grand Tour" pieces and include but are not limited to marble or wooden architectural models, paintings, etc. that tend to be "classical" (ie refer to Greek & Roman). Somewhat surprisingly, these have never really gone out of style with collectors today. The classical scene may refer to a myth or allegory, the identity of which is eluding me at the moment.
Based on the photos and information provided, and subject to examination, this is:

An antique Italian style Grand Tour carved and parcel gilt marble tondo
19th Century or earlier
The circular composition framing two standing figures in classical drapery, the male figure holding an apple (?) away from the female figure, alongside a third kneeling female figure, all against a backdrop of bullrushes. All within a cove molded rim.
approximately 11 1/2 inches (29 cm) diameter
CONDITION: some pitting and losses to parcel gilding throughout. Vertical split from top to bottom, braced on the back.
PROVENANCE: inherited
$800-1,200*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, and thank you again for using Mearto.