Conceptual art is focused more on the idea being expressed, while the form and material are secondary, Crystal & Company said.

A certificate is provided by the artist to authenticate an item, without which the piece is considered worthless. If the certificate gets lost or is damaged, the item may therefore lose value.

Crystal & Company is headquartered in New York with 10 regional offices throughout the US, placing over $1 billion in premiums annually in the global insurance marketplace.

AIG Private Client Group is a division of the member companies of American International Group.