A line of reasonably priced, Italian tweezers. They are made of stainless steel and incorporate finely serrated points to hold diamonds and other stones securely. They are 6-1/2" long.
The black are flat, non-glare matte finish.
Locking tweezers feature a slide mechanism that "clamps" the tweezers closed on the stone it is holding. This helps to prevent dropping and losing stones.