Heliodors are a variety of noble beryls, characterized by a lemon yellow and golden green color palette. The presence of iron ions determines the yellow color scheme of heliodor stones. Natural yellow beryls, known as heliodors, have yellowish-green, straw-yellow, golden, and honey-yellow hues. The name of the amazing stones comes from the Greek words "helios" - the sun and "doro" - a gift. At the beginning of the 20th century, geologists discovered in Namibia a large deposit of heliodors with a unique golden yellow color. In the jewelry market, these stones are called "golden beryl."
High-quality large-sized heliodors are rare. But, it is in large specimens that its golden color is best revealed. Minerals heliodors, members of the noble beryl family, have heavenly purity. High coefficient of hardness allows you to achieve amazing mirror polishing, providing excellent play of light on its faces. Natural stones are known for excellent resistance to any external influences.
Top jewelry manufacturers such as Tiffany & Co., Dior, Louis Vuitton include exquisite jewelry with heliodors in their collections. Due to the low popularity of gold beryls, products with them are found in single copies.
The absence of greenish and brownish tones greatly increases the cost of heliodors. Minerals of bright yellow tones, which are rarely present on the shelves of jewelry stores, are most valued. Ordinary tan stones are not very expensive. You can buy heliodors of this category at a price of several tens of dollars per carat. Natural stones rarely have internal or external defects. In this regard, even small inclusions and cracks greatly reduce the cost of stones. Large stones of the highest jewelry quality and golden yellow color can reach $ 60-120 per carat.
The best yellow beryls come from Brazil. Deposits located in the state of Minas Gerais, provide about 90% of the global production of these stones. The extraction of heliodors is carried out in Russia (Sherlovaya Gora field in Transbaikalia), Ukraine, and high-quality samples are mined in Namibia, the USA, Sri Lanka and Madagascar.
Improvement of heliodor
When heated to a temperature of 4.50 ° C, a change in the golden yellow color of the minerals to aquamarine tones is achieved. When exposed to rays of a certain spectrum, the color may change to orange. However, the changed color of the ennobled specimens is of a short nature, reversible. Over time, the original colors are restored. It should be noted that most of the low price aquamarines sold on the Russian jewelry market are ennobled heliodors.
Interesting facts about heliodor
At the Smithsonian Institution in Washington, the largest heliodore is stored. It has Brazilian origin, its mass is 2054 carats, and its length is 10.5 cm.
Not only Brazil, but also the Volynsk deposit in Ukraine shows collection samples of gold beryl.