Would like to point out that the d20 and d12 that came with my shipment have printing that is not centered. Additionally, the d20 and the d10 (double digit) are not of the same translucence as the other dice. I'm not sure if that's intended, but it does make the set look inconsistent.
levitasnidoVery similar issues here. My d10's and d20 are hardly translucent and a lot of numbers are off-center. One die has an airbubble, which is indicative of injection-molded plastic. I could have sworn the drop said they were actual stone (just not actual opalite). The description appears to have changed...
ThujoneThese are clearly not injected plastic. Opalite is a man made stone, which can have inconsistencies. My Opalite sets have been great from these drops
gheistOpalite is manmade opalescent glass. Still glass, still heavy. The fine suspension trait of the opalescence causes the thicker dice to be less translucent. They are all the same material, which is glass. The air bubbles are merely an after effect of the glass forming process.