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قراءة متعمقة

Boardman, John. Island Gems, 1963.

Boardman, John. Archaic Greek Gems, 1968.

وفي هذا الصدد، Brown, Clifford M. (ed). Engraved Gems : Survivals and Revivals, National Gallery of Art Washington, 1997. ,

ومن جهة أخرى، Kunz, George Frederick (1911). "Lapidary and Gem Cutting" . In Chisholm, Hugh (ed.). Encyclopædia Britannica. 16 (11th ed.). Cambridge University Press. pp. 195–199. This has more detail about lapidary in the ancient world, although only based on research available in the early 20th century.