These are beads made from large, translucent yellow sapphires that have been cut. Sapphires are the second hardest stone, after diamonds. Within the mineral corundum, those containing chromium and appearing red are called rubies, while all other colors are called sapphires. Sapphires come in blue, of course, but also in yellow, and are called "yellow sapphires." They are also sometimes affectionately called "pukraj stones." Rubies and sapphires have high hardness, but their structure can be fragile. To compensate for this, they are often treated with "impregnation," where colorless, transparent lead glass is used to fill in the raw stone. While I have selected stones that have undergone minimal impregnation, please understand this beforehand. (Number of beads) 1 (Bead size) Approximately 11.3 mm * Although sapphire itself is a hard stone, the impregnating material is relatively soft. Please consider this, and understand that there may be chipping around the holes, roughness on the surface, and parts that are not perfectly round. Shipping will be via Mercari delivery with tracking. I will be slow to respond on weekdays, but I will always reply to your comments. ・Ruby ・Natural stone ・Tourmaline ・Ruby ・Corundum ・Beads 【Management No.】Z-11 #MorinoIshiyaSapphire ← By stone #MorinoIshiyaBeads ← By item #MorinoIshiyaYellow ← By color #MorinoIshiya ← All products