My guess is stone or a marble. It is very heavy, weighing 16.5kg. There is a slight curving to the top of the board and the top and sides are glazed. This would also make an ideal table top, fitted into a frame of some kind.
No chess pieces are included. Please view photos as they form part of the description. Length of entire board - 90cm. Actual size of playing area 40cm x 40cm. The item "Unique Chess Board/Table Top Carved/engraved Stone/marble (16.5kg)" is in sale since Sunday, December 8, 2019.
This item is in the category "Toys & Games\Games\Chess\Contemporary Chess". The seller is "sandra098" and is located in Boston. This item can be shipped to United Kingdom, Antigua and barbuda, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, United States, Bahrain, Canada, Japan, New Zealand, China, Israel, Hong Kong, Norway, Indonesia, Malaysia, Mexico, Singapore, South Korea, Switzerland, Taiwan, Thailand, Bangladesh, Belize, Bermuda, Bolivia, Barbados, Brunei darussalam, Dominica, Egypt, Guernsey, Gibraltar, Guadeloupe, Grenada, French guiana, Iceland, Jersey, Jordan, Cambodia, Saint kitts and nevis, Saint lucia, Liechtenstein, Sri lanka, Macao, Monaco, Maldives, Montserrat, Martinique, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Turks and caicos islands, Aruba, Saudi arabia, South africa, United arab emirates, Ukraine, Chile, Bahamas, Colombia, Costa rica, Guatemala, Honduras, Jamaica, Kuwait, Panama, Philippines, Qatar, Trinidad and tobago, Uruguay, Cayman islands.