紅玉髓天珠 3300BC – 1100AD
紅玉髓天珠從石質來看，屬於玉髓（Chalcedony）質，與水晶同屬二氧化矽，但其結晶則屬隱晶類的微結晶體，顏色分別有白色、藍色、綠色、棕色、黑色、紅色等，其中紅色的品種稱為 Carnelian 即紅玉髓。外國學者認為紅玉髓天珠是矩今5,300年前，美索不達美亞人的貨幣，是用化學顏料塗在珠子上燒製而成，所以稱之為鑲蝕紅玉髓（Etched Carnelian），並將之列為天珠家族(dZi family)成員之一。傳世的紅玉髓天珠頗多，30mm以上的較稀少。
---摘自《天珠探秘叢書》﹙1﹚〈藏傳天珠 . 源起 . 真品天珠鑑賞〉
Carnelian dZi 3300 BC – 1100 AD
When look at the texture of carnelian, it belongs to chalcedony texture, the same as crystal which belongs to silicon dioxide (SiO2), but its crystal belongs to micro-crystal in hidden crystal type, it has different colours like white, blue, green, brown, black and red etc..., among them red colour type is called carnelian. Western scholars think that carnelian dZi has over 5,300 years of history, the currency of Mesopotamia people is made by applying a chemical colourings on top of the bead and put under high temperature, that's why it is called etched carnelian, and list it as a member of the dZi family. There is quite a lot of inherited carnelian dZi, but those over 30 mm are rare.
---Exploring Mystic dZi Series(1) -Tibetan dZi.Origination.Authentic dZi Appreciation