Composition: SiO2
crystal System:
Prismatic--Hexagional, terminated in positive and negative rhombohedra, very fine growth striations at right angles to the lenght of the prism
Refractive Index:
Double Refraction and Optic Sign:
0.009 positive
Low (0.013)
Specific Gravity: 2.65
Hardness: 7
Fracture: Concohoidal
Lustre: Viterious
Pleochroism: Weak
Absorption Spectrum:
Inclusions: Twinning planes
Occurrence: World wide


Purple has long been considered a royal colour so it is not surprising that Amethyst has been in so much demand during history.  Fine Amethyst are featured in the British Crown Jewels and were also a favourite of Catherine The Great and Egyptian royality. Amethyst, the transparent purple vaiety of Quartz, is the most important Quartz vatiety used in jewellery.
Because Amethyst was thought to encourage celibacy and symbolize piety, it was very important in the ornamentation of Catholic and other churches in the middle ages. It was, in particular, considered to be the stone of Bishops and they still often wear Amethyst rings.
Leonardo Da Vinci wrote that Amethyst was able to dissipate evil thoughts and quicken the intelligence.

In Tibet, Amethyst is considered to be sacred to Budda and rosaries are often fashioned from it.

The Greek word "amethystos" basically can be translated as "not drunken" and Amethyst was considered to be a strong antidote against drunkeness and overcoming addiction, which is why wine goblets were often carved from Amethyst! It has been used for hearing disorders,  insomnia, headaches and others pains, some sources suggest it is used to stabalize metal disorders.The gemstone symbolizes sobriety.
Worn to make the wearer gentle ane amiable, amethyst powers include: dreams, healing, peace, love, spiritual upliftment, courage, psychism, protection against thieves and happiness.
Amethyst ranges in colour from pale lilac to deep purple, the plae colours are sometimes called "Rose de France" and can be seen set in Victorian jewellery, the deep purple colours are the most valuable, particularly a rich purple with rose flashes.

John Cadby Jewellers
 Goldsmith, Silversmith,
Diamond Merchants, Appraiser & Engraver.
3, White Hart Yard, Trowbridge, Wiltshire.  BA14 8BY
Tel: 01225 776322  E-Mail: