Natural topaz * 1 piece This gemstone has been identified by an authoritative international gemstone identification agency and comes with an identification certificate. It is a silicate mineral containing fluorine and aluminum, also known as Topaz in English. In business, the English transliteration name "Topaz" is often used to label gemstones. Because of its high transparency, high hardness, good reflective effect, and its beautiful color, it is favored. For example, the Braganza diamond (1,640 carats) in the Portuguese crown in the 17th century was once considered the largest diamond and has been proven to be a colorless topaz.