2.37ct Set of 3 Cushion Cut Rubies Carat Gauge and Guide PWM Frequency: 12khz

PWM Frequency: 12khz

rotate the knob can set the value of the current setting

easily detect socket wiring

Use this aluminium alloy stand  for clamping 32-34mm microscope

Rimmed edge prevents work rolling of table

2.37ct Set of 3 Cushion Cut Rubies Carat Gauge and Guide PWM Frequency: 12khzRubys hues vary from orangey red to purplish red and the presence of chromium is the trace element that causes the unparalleled ruby red colour. The most valuable colour is the pigeons blood variety which is a vibrant red without any orange or purple tint. Some rubies display the gemmological phenomenon called asterism where cabochon cut stones have a whitish star on top of the dome. This is created by fine intersecting rutile needle inclusions.;