These are dichroic glass nuggets. The bottom is flat. Because it's dichroic, it sparkles and is very beautiful ✨ Expensive dichroic glass is used. Size: Approximately 11.5-12.5mm. 9 pieces These are handmade by an amateur, so there may be some irregularities. Please refrain from purchasing if you are looking for perfection. The color may appear different depending on the lighting and how the light hits it. Please understand. If you purchase multiple items, we will discount 100 yen from the second item. Thank you. Fusing glass Dichroic glass Dichroic nugget Glass nugget Glass cabochon Handmade Glass Accessory materials Glass cabochon Handmade Glass Accessory materials Stained glass 1300