No. The hardness of serpentine is 3-4.5, whereas a hardness of at least 7 is needed to scratch glass.
orthoclase
Diamond will scratch anything.
A few minerals that do not scratch glass come to mind . . . talc, asbestos, mica, for instance.
topaz
6.0
The Mohs hardness of serpentine is 2,5-3; it a soft mineral. Not scrached by a graphite pen; scratched by fingernail, copper etc.
orthoclase
Diamond will scratch anything.
A few minerals that do not scratch glass come to mind . . . talc, asbestos, mica, for instance.
quartz
n
topaz
6.0
diamond
Between 3.5 and 5.5 on the Mohs scale of mineral hardness.
Your answer depends on the composition of the 'fake diamond' and the composition of glass. Each mineral has a rating on the Mohs Scale of hardness. The harder mineral will scratch the softer mineral.
The hardness of glass is around 6, and the hardness of iron is about 5. So your mineral is probably around a 5.5.