Sieber Agate Tumbles #1 measure approximately 1" to 1 7/16" (25mm x 38mm) and weigh approximately .3 to .9 ounces (7.9 to 22.9 grams). Please let me pick one for you. These are $3.00 USD each.
Hardness: Unknown
Origin: Germany
From MetaphysicalRealm1.com - Sieber "Agate" is another slag like Swedish Blue from a Copper foundary in the 1400's in Germany. These Tumbles are mainly blues, but there is some green/gray in some of them as well.