earth(-en), (pot-)sherd, + stone

Boyd’s Bible Dictionary:

(pot-fragment). A piece of broken pottery (Prov. 26:23).

“Potsherd” From Concise Bible Dictionary:

 
2-3rd Century AD Pottery Shard
A fragment of pottery, to which man is compared when he strives with his Maker (Isa. 45:9). David quotes the word in the Psalm prophetical of the Lord’s sacrificial sufferings, “My strength is dried up like a potsherd” (Psa. 22:15). It is employed literally in Job 2:8; Proverbs 26:23 and translated “sherd” in Isaiah 30:14 and Ezekiel 23:34.

“Sherd” From Concise Bible Dictionary:

A fragment of earthenware, the same as “potsherd” (Isa. 30:14; Ezek. 23:34).
 
2-3rd Century A.D. Pottery Shard

Strong’s Dictionary of Hebrew Words:

Number:
2789 (find all occurrences in KJV Bible)
Transliteration:
cheres
Phonic:
kheh’-res
Meaning:
a collateral form mediating between 2775 and 2791; a piece of pottery
KJV Usage:
earth(-en), (pot-)sherd, + stone