These are beads cut from large, translucent yellow sapphires. Sapphires are the second hardest stones after diamonds. Within the mineral corundum, those containing chromium and exhibiting a red color are called rubies, while all other colors are called sapphires. Of course, blue, but also yellow like this, is treated as a sapphire, and is called "yellow sapphire." It is also sometimes called "pukraj stone." Rubies and sapphires have high hardness, but on the other hand, their structure is fragile, and in order to basically reinforce their strength, they undergo "impregnation treatment," which involves filling the raw stone with colorless, transparent lead glass. While I have selected items that have undergone only minimal impregnation treatment, please consider this beforehand. (Number of beads) 1 (Bead size) Approximately 11.8 mm ※ Although sapphire itself is a hard stone, the impregnating material is a relatively soft substance. Please understand that there may be chipping around the holes, roughness on the surface, and parts that are not perfectly round before considering. Shipping will be via Mercari delivery with tracking. Replies will be delayed on weekdays, but I will always respond if you leave a comment. ・Ruby ・Natural stone ・Tourmaline ・Ruby ・Corundum ・Beads 【Management No.】Z-3 #MorinoIshiyaSapphire ← By stone #MorinoIshiyaBeads ← By item #MorinoIshiyaYellow ← By color #MorinoIshiya ← All products