Quote:
|
Originally Posted by mykeris
All these Yakut stones are actually soft with measurement of 4 to 5 on diamond scale.
|
Well, if Yakut=rock crystal=quartz crystal it should read 7 on the Mohs scale (i assume that this is what you mean by diamond scale. Mohs is the standard scale for mineral hardness). Flourite would be a 4, apatite is 5. Both these stones are perhaps too soft for this purpose.