Chinese Teapot and Tray Carved Stone with Chinese Characters

Description

The history of this teapot and tray, and from what period it unknown to me.
Some of the character meanings:
永古之寳
'Everlasting Treasure'
石子
'Cobblestone'
All in all, a very interesting teapot that has been carved of a hard stone.  Although it has been used, I did not find any cracks or chips.
The Tea Pot
is 6" wide which includes the handle and spout, 3" wide w/o handle and spout.  The bottom
circumference is 2 3/4" and the opening is 1 1/4".
It weighs:  8.4oz
The Tray
is 5 1/4" at the widest part and 4 1/4" at the narrow area.
It weights:  6.4oz.
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