Spinel, maybe, also maybe ruby, maybe tourmaline, maybe garnet, maybe glass, etc…
If these are certified as spinels, then any idea the cost of 30ct rough spinel shown in the above picture.
Judging value from your photo is like trying to determine the flavor of this dessert from this photo
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MMM coconut coffee ? the luster right , not sure if coffee is cubic, the fracture looks wrong could be man made.
Yes, yes, Google Images. Perhaps you can assist them in creating “Gemstone Rough Values”?
Are the crystals singly or doubly refractive in your polariscope? If doubly refractive, then NOT spinel. ;))