GemDuo Jet Ab is a diamond-shaped bead with two parallel holes going through the length of a bead. 

Designing with GemDuo Beads:

GemDuo beads have a gently beveled top with a raised ridge in the center. These beads are very similar to DiamondDuos and can be used in many patterns that call for DiamonDuos. Use GemDuo Beads with other Czech glass beads to create attractive patterns and designs.

GemDuo specifications:

• Color: Jet Ab
• Category: 2-Hole Bead
• Shape: GemDuo, diamond
• Country: Czech Republic 
• Material: Lead-Free Glass
• Measurements: 8x5mm
• Hole size: 0.8mm, fits up to 24 gauge wire or thread
• Quantity: GemDuo Jet Ab beads are sold by 8 grams (approximately 50 pieces)