Marquise Opal Triplet Cabochon Engraving Blocks These discs feature a flexible

These discs feature a flexible plastic backing with brass centers that snap securely onto special 3/32" mandrels

which is an inherent characteristic of this cutting geometry rather than a defect

The Grobet USA Crossing Precision File features a distinctive double-radius profile — half-round on two sides

5 × 5mm and 13

The diopter number in the upper left corner of each lens plate indicates its approximate power

Marquise Opal Triplet Cabochon Engraving Blocks These discs feature a flexibleOpal is the world's most popular phenomenal gemstone, with many cultures believing that opals have supernatural origins and power. These Marquise Opal Triplet Cabochons are crafted by bonding a piece of genuine opal to a black agate backing, then capping it with a colorless glass top. This triplet construction enhances the stability and protection of the opal while increasing the contrast of the play of color displayed making each stone more vivid and