u/Adorable-Tap-9763

Why are there so many listings of cut diamonds with such low prices? And what are they, if they are not diamonds? Cubic Zirconia or Moissanite? Usually, the liisting should differentiate between these and every listing says Diamond, but they are so stupid cheap. So what are they?

I used an oxy-propane torch with a 1.0mm nozzle, glazed the ceramic dish with Borax beforehand, melted the copper and silver first and then melted the gold. The pour failed and this is what was left in the ceramic dish. What happened? What did I do wrong? The blob of gold that is left also is 0.36g lighter than what I had before