These are beads cut from large, translucent yellow sapphires. Sapphires are the second hardest stones, after diamonds. Within the corundum mineral group, those containing chromium and appearing red are called rubies, while all other colors are called sapphires. This includes not only blue sapphires, but also yellow ones, which are known as "yellow sapphires." They are sometimes affectionately called "pukraj stones." Rubies and sapphires, while hard, can have fragile structures. To improve their strength, they are often treated with "impregnation," where colorless lead glass is used to fill in imperfections in the raw stone. While I have selected items with minimal impregnation, please be aware of this treatment before considering a purchase. (Number of beads) 1 (Bead size) Approximately 11.8 mm ※ Although sapphires themselves are hard stones, the impregnating material is relatively soft. Please understand that there may be chipping around the holes, surface roughness, and non-perfectly round shapes before considering a purchase. Shipping will be via Mercari's tracked delivery service. I may be slow to respond on weekdays, but I will always reply to your comments. ・Ruby ・Natural stone ・Tourmaline ・Ruby ・Corundum ・Beads 【Management No.】Z-2 #MorinoIshiyaSapphire ← By stone type #MorinoIshiyaBeads ← By item type #MorinoIshiyaYellow ← By color #MorinoIshiya ← All products