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I don't see diamond but I do see topaz and zircon for a first up guess, as part of the process of elimination. From top to bottom #s 3, 4 & 5 - topaz, topaz, zircon. 6 looks interesting as a carving stone. If there is a feather-like crack or inclusion that reaches into the stone, by as much as 1/2 to 1 mm, is a fair indication of topaz that has had a fracture occur along the crystal axis after a collision. Zircon will crack along the length of, into and through the stone or show colloidal fracturing, like windscreen cracking and so will quartz, that is when you go to the next determinates in the exciting world of "Name that Stone".
Do a search on goldierocks name for his determinates to identify your finds. One of the most helpful is the scratch test and then the density equation.
Do a search on goldierocks name for his determinates to identify your finds. One of the most helpful is the scratch test and then the density equation.