Feature Gems & Gemology, Summer 2000, Vol. 36, No. 2

New Filling Material for Diamonds from Oved Diamond Company: A Preliminary Study

Diamonds filled with a new glass formulation (XL-21) are being marketed by the Oved Diamond Company. These diamonds are readily identifiable as treated by the intense flash-effect colors seen with magnification. Durability testing on a small number of these treated diamonds indicates that this filler material is more stable to conditions of normal jewelry repair, such as direct heating with a torch, than the filler material produced by the Goldman Oved Company a decade ago. Nevertheless, some damage to the filler was observed in half the new Oved diamonds that were subjected to a standard prong retipping.