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 exhibiting a red color are called rubies, while all other colors are called sapphires. Sapphires come in blue, of course, but also in yellow, and are known as "yellow sapphires." They are sometimes affectionately called "pukraj stones." Rubies and sapphires have high hardness but also have fragile structures. 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 treatment, please consider this beforehand. (Number of beads) 1 (Bead size) Approximately 10.8 mm ※ Although sapphire itself is a hard stone, 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 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-18 #MorinoIshiyaSapphire ← By stone #MorinoIshiyaBeads ← By item #MorinoIshiyaYellow ← By color #MorinoIshiya ← All products