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 10mm, 12 pieces *Lavender is a color-changing item. It turns a light blue depending on the light source. These are handmade by an amateur, so there may be some imperfections. 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, you will receive a 100 yen discount on the second item onwards. Thank you. Fused glass Dichroic glass Dichroic nugget Glass nugget Glass cabochon Handmade Glass Accessory materials Glass cabochon Handmade Glass Accessory materials Stained glass 1300