About 20 years ago I worked in a rock quarry and collected samples. There was this one mineral that looked exactly like raw diamonds crystal clear. The hardness was off the chart with what I had available. Quartz wouldn't scratch it, nor iron file. I didn't have sapphires and I used a CZ ring didn't scratch it either. I have moved many times and lost the collection moving but came across a term called merkles or herkles diamonds has anyone heard of these could give me some more info?