At acorn war I had a chance to take a cuttlebone casting class from Alail. I decided to try a lunula, a crescent shape pendant common in Russia and other Slavic areas.
I got a good cast on the first pour but blew out the mold on the second. I noticed that the texture of the cuttlebone transfers to the cast object. The actual casting has gone missing before I could finish cleaning it up.
This was a general idea of lunula-ness with out a model handy. Lunula had a wide range of complexity and detail. This would be a simpler one. Lead-Tin alloys were known in early medieval russia, though casting mold evidence is usually stone. Cuttlebone is likely not a period casting method in Russia, tho its fragile nature makes finds rare. Regardless this is a quick and easy way to experiment.
Some west Slavic casting molds, including for lunula. Found at http://west-slavs.tumblr.com/post/98980928030/early-medieval-west-slavic-jewellery-making-forms
More information on lunula
Khamayko, Natalia. ‘
Crescent pendants (lunnitsa) in 11th – 13th Century rus’: pagan amulet or Christian ornament? Rome, Constantinople and Newly-Converted Europe:
Archaeological and Historical Evidence. Instytut Archeologii i Etnologii Polskiej Akademii Nauk, Warszawa 2012