Amethyst: Meaning, Characteristics and Jewellery

Published on March 8, 2023 · Updated on October 11, 2026

Home » Gemstones: A Comprehensive Guide » Amethyst: Meaning, Characteristics and Jewellery

The amethyst is the violet or purple variety of quartz and the most striking gemstone in this group. In this guide, you’ll find out about the meaning of amethyst, its properties and characteristics, how it is graded, where it is found, the treatments it undergoes (including heat treatment to produce citrine), its use in jewellery and how to care for it. At the end, there is an FAQ section covering the most common questions.

Amethyst has always been highly prized. According to reports, Empress Catherine the Great was a great admirer of the gem and sent many miners to the Ural Mountains to search for it. For a long time, it was considered as precious as diamonds, rubies, sapphires and emeralds.

What is an amethyst?

Amethyst is a variety of quartz (SiO₂), ranging in colour from lavender to deep purple. Until the 18th century, it was one of the most highly prized precious gemstones. After large deposits were discovered, mainly in Brazil, its value fell and today it is considered an affordable semi-precious gemstone. Its beauty, however, remains the same, and amethyst never goes out of fashion.

Origin of the name and history

The name comes from the Greek amethystos, formed from a- (‘not’) and methyskein (‘to make drunk’), meaning ‘not drunk’. According to ancient belief, the stone protected its owner from drunkenness, and the Greeks made amethyst cups for wine. The Egyptians already used it as a gemstone, and in antiquity it was widely used in carved gemstones and amulets. In the Middle Ages, amethyst came to be associated with royalty and the clergy, and it is still commonly found in bishops’ rings.

Video about amethyst

A terra das pedras preciosas gigantes Ametista do Sul 11:25

Ametista - Caracteristicas, Comercialização e Avaliação09:18

O processo de extração da pedra Ametista04:34

The meaning of the amethyst stone

The meanings attributed to amethyst stem from tradition and belief, rather than scientific evidence. In ancient times, it was used to protect people from drunkenness and intoxication, hence its name. Today, it is associated with serenity, faith, wisdom and spirituality. In esoteric tradition, amethyst is also said to offer protection against negative thoughts and promote emotional balance, and it is linked to the forehead chakra, the ‘third eye’. None of this has been proven.

Amethyst is the birthstone for February, and one of the sources consulted lists it as the stone for the 6th and 17th wedding anniversaries.

Properties and gemmological characteristics of amethyst

Mineral class: quartz;
Crystal system: trigonal, in six-sided prisms;
Chemical formula: SiO₂;
Hardness: 7 on the Mohs scale;
Density: approximately 2.63 to 2.65;
Refractive index: approximately 1.544 to 1.553, with a birefringence of 0.009;
Transparency: from transparent to translucent;
Colour: ranging from violet and purple to light and dark purple;
Pleochroism: weak to moderate (from reddish-purple to bluish-purple);
Lustre: vitreous;
Fluorescence: faint or absent;
Fracture: conchoidal, brittle.

Where does colour come from?

The colour of amethyst comes from traces of iron (Fe³⁺) replacing silicon in the quartz structure, combined with the natural radiation from the surrounding rocks, which transforms the iron into a colour centre. Consequently, the shades range from lavender to deep purple, with secondary tones of red and blue.

The colour is not distributed evenly. It appears in patches, in irregular areas and, often, in bands, and is most intense at the tips of the crystals. This zoning determines the type of cut required to make the best use of the gemstone. Amethysts with an even distribution of colour are rare and command high prices.

Crystal structure

Amethyst has a structure comprising alternating layers of left- and right-twinned quartz, known as the Brazilian twinning. This is why the stone may fracture in a wavy pattern or display ‘fingerprints’. Some mineralogists apply the name ‘amethyst’ to all quartz with this structure, regardless of colour. Some amethysts display white bands of milky quartz.

Pedra Ametista Bruta — Raw Amethyst Stone

Amethysts form in cavities within basalt, in geodes, where the crystals grow from the wall towards the centre on a layer of chalcedony. In southern Brazil and Uruguay, these basalts formed over 130 million years ago.

Trade: where amethyst is found

Amethyst is widely available and reasonably priced, but the most beautiful and valuable varieties come from just a few places and have deeper, purplish or violet colours.

Brazil is the largest producer by volume, particularly in Rio Grande do Sul (the Ametista do Sul region, where there are geodes over two metres tall), in Minas Gerais, in Pará and in Bahia. In Bahia, the municipality of Brejinho das Ametistas, in the south-west of the state, is known for a warmer-toned amethyst with a reddish secondary colour. Much of the Brazilian material is heat-treated and sold as citrine, whilst another portion is used for decorative purposes and collections, in the form of geodes.

Other important sources are Uruguay (Artigas, with a higher proportion of deep colour), Zambia (deep purple, slightly reddish and with few inclusions), Bolivia, Russia (the Urals), Mexico, Namibia, Madagascar, Sri Lanka, India, Canada and the United States. As the shades vary from one region to another, amethysts are usually named after their country of origin, such as Brazilian or Bolivian amethyst.

Assessment of amethyst

The ‘4 Cs’ (colour, clarity, carat weight and cut) were originally devised for diamonds, but are widely used to evaluate other gemstones, including amethyst. See also the post on the 4 basic diamond classifications. For amethyst, colour is the most important factor, followed by clarity.

Colour: There is no formal international classification standard. The trade uses terms such as ‘Siberian’ (a deep, saturated colour with red and bluish flashes), ‘deep’, ‘medium’ and ‘light’. The most valuable amethysts have a strong purple colour, verging on reddish, and the colour is evenly distributed, without zoning. Very dark stones are worth less because they lose their lustre, and brown or bronze tones also reduce their value. To see the zoning with the naked eye, buyers usually place the stone on a white surface;
Purity: inclusions determine the degree of purity. The fewer the inclusions, the higher the value. Most faceted amethysts on sale have no inclusions visible to the naked eye, but fractures are common;
Weight and size: weight is measured in carats and stones are graded in millimetres. Large centre stones are widely used in jewellery, provided the final price is not too high;
Cutting and polishing: most amethysts are facetted to make the most of their colour and minimise the appearance of inclusions. Stones with highly visible inclusions are cut into small cabochons or beads.

Joia com pedra Ametista — Jewellery featuring an amethyst

Oval, pear, emerald, triangular, marquise and cushion cuts are widely used, and there are also step cuts, mixed cuts and so-called fancy cuts, which are generally mass-produced for collections. Animal sculptures are also carved from amethyst. With high supply, amethyst is a relatively inexpensive gemstone that is easy to buy.

Variations in shades

Amethysts come in a wide variety of shades, depending on where they are found:

Siberian: today, this is primarily a commercial term for a deep colour with red and bluish flashes, and does not indicate the stone’s origin. Amethysts from the Urals in Russia were the benchmark and are now mainly sought after by collectors;
Uruguay: a higher proportion of deep purple stones;
Africa (Zambia): deep purple, with a slight reddish tinge, and few inclusions. The term ‘African amethyst’ is used for darker shades and does not always indicate the origin;
Brazil: available in all sizes and shapes, in a range of colours from light purple to deep purple. The lighter colours meet market demand.

Treatments and synthetic amethyst

Heating: when heated to around 470–560 °C, amethyst turns yellow, orange or brown and is sold as citrine. Under specific conditions, it can turn green, known as green quartz or prasiolite, which is rarely found in its natural form. When heated, the stone loses the pleochroism characteristic of amethyst;
Irradiation: gamma radiation can deepen the colour of light-coloured stones. It is difficult to detect and is not always disclosed;
Fractures: Treatment for fractures is rarely required, as there are many stones with no visible fractures.

Citrine: is the yellow to orange variety of quartz, with a colour associated with iron. Natural citrine is rare and tends to be lighter in colour. Most of the citrine sold is, in fact, heated amethyst or smoky quartz. Treated stones may display a more reddish colour and lose their pleochroism. Brazil is one of the largest sources, particularly the state of Rio Grande do Sul. Citrine is cheaper than amethyst and is widely used in jewellery, including as a substitute for yellow gemstones such as topaz and yellow sapphire.

Synthetic amethyst has been produced since the 1970s using a hydrothermal method, in a high-pressure autoclave, and has the same composition and properties as natural amethyst. It can usually only be distinguished through laboratory tests. The ‘macla’ pattern found in Brazilian amethyst (present in natural amethyst but generally absent in synthetic amethyst), a ‘loaf of bread’ or ‘tiger stripe’ zoning pattern, and traces of the seed plate are all indications of a synthetic stone. For high-value purchases, ask for a report from a gemmological laboratory.

Amethyst in jewellery

Amethyst is one of the most commonly used gemstones in jewellery: rings, necklaces, earrings, bracelets and pendants. With a hardness of 7, it is durable enough for everyday wear, and lower-quality stones are cut into beads and cabochons. It features in both expensive jewellery and more affordable pieces. To compare it with other coloured gemstones, see the posts on emerald, sapphire and tourmaline.

Caring for amethyst

Usage: Remove the jewellery during activities where the stone may be scratched or knocked. Amethyst forms curved fractures if struck with force;
Light and heat: do not expose the stone to intense sunlight, radiation or intense heat for long periods, as this may cause it to fade or change colour;
Cleaning: use warm water, mild soap and a soft cloth or toothbrush. Take care when using ultrasound or steam, and avoid chemicals and abrasives;
Storage: store the piece wrapped in a soft cloth or in a lined box, away from harder stones, which may scratch it.

Sources consulted

Frequently Asked Questions

What is an amethyst?

Amethyst is the violet or purple variety of quartz (SiO₂). It is one of the most commonly used gemstones in jewellery and is the birthstone for February.

What is the significance of the amethyst?

Traditionally, amethyst is associated with serenity, faith, wisdom and protection against drunkenness, which explains its Greek name, meaning ‘not drunk’. These meanings stem from belief rather than scientific evidence.

What are the properties of amethyst?

Hardness 7 on the Mohs scale, density approximately 2.65, refractive index 1.544 to 1.553, vitreous lustre, conchoidal fracture and weak or absent fluorescence. The crystal system is trigonal.

Why is amethyst purple?

The colour comes from traces of iron in the quartz structure, combined with natural radiation from the surrounding rocks. The colour is usually more intense at the tips of the crystals and may form zones or bands.

Where does amethyst come from?

Brazil is the largest producer by volume, with Rio Grande do Sul, Minas Gerais, Pará and Bahia being the main producers. There are also sources in Uruguay, Zambia, Bolivia and Russia.

What determines the value of an amethyst?

Colour is the most important factor: a deep purple, preferably with a reddish tinge, and evenly distributed. Next come clarity (few inclusions), size and cut. Stones that are very dark or have brownish tones are worth less.

Does heated amethyst turn into citrine?

Yes. When heated to between 470 and 560 °C, amethyst turns yellow, orange or brown and is sold as citrine. Most of the citrine sold commercially is heated amethyst or smoky quartz.

How can you tell if an amethyst is synthetic?

It is difficult to tell with the naked eye, because the synthetic (hydrothermal) variety has the same composition as the natural one. The Brazilian inclusions and the type of zoning help with identification. For high-value purchases, ask for a gemmological laboratory report.

Does amethyst fade in the sun?

It can. Prolonged exposure to strong light, radiation or heat may cause the jewellery to fade or change colour. Keep the jewellery out of direct sunlight when not in use.

How do you clean amethyst jewellery?

Use warm water, mild soap and a soft cloth or toothbrush. Exercise caution with ultrasonic cleaning and steam, and avoid chemicals and abrasives. Store the item separately from harder stones.

Written by Willy Sievert

Editor of Bahia.ws since its founding in 2009. Based in Salvador, he travels frequently across the Northeast and all of Brazil to keep the guides up to date. Learn more about Willy Sievert →