They are not Diamond Crystals! If they were, then they would have an outer appearance of the dull side of Aluminum Foil. Are they totally clear or are they slightly purple as in the pic? If the latter, then they are technically Quartz crystals with two zones, Clear Quartz and Amethyst! It is hard to tell from the pic but the crystals appear to be cloudy (i.e. contain inclusions, internal cracks, etc.) and if so, would not be real Gem Quality. They are really only worth possibly up to $10 for the larger ones and $3 or so for the smaller ones but as always, they are worth what someone is willing to pay for them!
yes
Frank