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Alexandrite

Red by candlelight yet green in daylight – alexandrite's characteristic feature is its striking ability to change colour, known as ‘pleochroism’. At RenéSim, we supply this beautiful and precious gemstone in the carat weight and cut of your choice.

Alexandrite round cut 0.64 ct Alexandrite round cut 0.64 ct

Alexandrite in round cut with colour change, size 5.47 mm

EUR 9,890
Incl. VAT and free shipping

 
Alexandrite round cut 0.66 ct Alexandrite round cut 0.66 ct

Alexandrite in round cut with colour change, size 5.18 mm

EUR 9,990
Incl. VAT and free shipping

 
Alexandrite round cut 0.66 ct Alexandrite round cut 0.66 ct

Alexandrite in round cut with colour change, size 5.24 mm

EUR 9,990
Incl. VAT and free shipping

 
Alexandrite round cut 0.67 ct Alexandrite round cut 0.67 ct

Alexandrite in round cut with colour change, size 4.96 mm

EUR 10,490
Incl. VAT and free shipping

 
Alexandrite round cut 0.68 ct Alexandrite round cut 0.68 ct

Alexandrite in round cut with colour change, size 5.17 mm

EUR 10,490
Incl. VAT and free shipping

 
Alexandrite round cut 0.74 ct Alexandrite round cut 0.74 ct

Alexandrite in round cut with colour change, size 5.42 mm

EUR 11,490
Incl. VAT and free shipping

 
Precious jewellery is a matter of trust!

RenéSim is your online jeweller with 180 years of family tradition. We are happy to provide personal advice – we work with you to create the perfect piece of jewellery for all occasions. Simply contact us.

+44 20 351 466 05Call us from Monday to Friday, 9 am – 7 pm

Alexandrite round cut 0.76 ct Alexandrite round cut 0.76 ct

Alexandrite in round cut with colour change, size 5.40 mm

EUR 11,490
Incl. VAT and free shipping

 
Alexandrite round cut 0.81 ct Alexandrite round cut 0.81 ct

Alexandrite in round cut with colour change, size 5.68 mm

EUR 13,490
Incl. VAT and free shipping

 
Alexandrite round cut 0.89 ct Alexandrite round cut 0.89 ct

Alexandrite in round cut with colour change, size 5.78 mm

EUR 13,900
Incl. VAT and free shipping

 
Alexandrite round cut 1.03 ct Alexandrite round cut 1.03 ct

Alexandrite in round cut with colour change, size 6.09 mm

EUR 13,900
Incl. VAT and free shipping

 
Alexandrite oval cut 1.45 ct Alexandrite oval cut 1.45 ct

Alexandrite in oval cut with colour change. Size 8.90 x 6.58 mm

EUR 13,900
Incl. VAT and free shipping

 
Alexandrite oval cut 0.71 ct Alexandrite oval cut 0.71 ct

Alexandrite in oval cut with colour change, size 6.25 x 4.78 mm

EUR 6,790
Incl. VAT and free shipping

 
Precious jewellery is a matter of trust!

RenéSim is your online jeweller with 180 years of family tradition. We are happy to provide personal advice – we work with you to create the perfect piece of jewellery for all occasions. Simply contact us.

+44 20 351 466 05Call us from Monday to Friday, 9 am – 7 pm

Alexandrite oval cut 0.96 ct Alexandrite oval cut 0.96 ct

Alexandrite in oval cut with colour change, size 6.73 x 4.95 mm

EUR 15,900
Incl. VAT and free shipping

 
Alexandrite pear cut 1.13 ct Alexandrite pear cut 1.13 ct

Alexandrite in pear cut with colour change. Size 8.40 x 5.60 mm

EUR 9,390
Incl. VAT and free shipping

 
Alexandrite pear cut 1.23 ct Alexandrite pear cut 1.23 ct

Alexandrite in pear cut with colour change. Size 8.02 x 5.54 mm

EUR 11,900
Incl. VAT and free shipping

 
Alexandrite marquise cut 0.42 ct Alexandrite marquise cut 0.42 ct

Alexandrite in marquise cut with colour change. Size 7.50 x 3.30 mm

EUR 2,690
Incl. VAT and free shipping

 
Alexandrite marquise cut 0.69 ct Alexandrite marquise cut 0.69 ct

Alexandrite in marquise cut with colour change. Size 8.60 x 3.85 mm

EUR 3,790
Incl. VAT and free shipping

 
Alexandrite marquise cut 0.76 ct Alexandrite marquise cut 0.76 ct

Alexandrite in marquise cut with colour change. Size 8.44 x 4.07 mm

EUR 4,190
Incl. VAT and free shipping

 
Precious jewellery is a matter of trust!

RenéSim is your online jeweller with 180 years of family tradition. We are happy to provide personal advice – we work with you to create the perfect piece of jewellery for all occasions. Simply contact us.

+44 20 351 466 05Call us from Monday to Friday, 9 am – 7 pm

Alexandrite emerald cut 0.72 ct Alexandrite emerald cut 0.72 ct

Alexandrite in emerald cut with colour change. Size 5.83 x 4.48 mm

EUR 8,090
Incl. VAT and free shipping

 
Alexandrite emerald cut 0.72 ct Alexandrite emerald cut 0.72 ct

Alexandrite in emerald cut with colour change. Size 5.76 x 4.26 mm

EUR 7,990
Incl. VAT and free shipping

 
Alexandrite emerald cut 0.73 ct Alexandrite emerald cut 0.73 ct

Alexandrite in emerald cut with colour change. Size 5.77 x 4.22 mm

EUR 8,090
Incl. VAT and free shipping

 
Alexandrite emerald cut 0.76 ct Alexandrite emerald cut 0.76 ct

Alexandrite in emerald cut with colour change. Size 6.29 x 4.35 mm

EUR 8,390
Incl. VAT and free shipping

 
Alexandrite emerald cut 0.76 ct Alexandrite emerald cut 0.76 ct

Alexandrite in emerald cut with colour change. Size 5.79 x 4.44 mm

EUR 8,490
Incl. VAT and free shipping

 
Alexandrite emerald cut 0.78 ct Alexandrite emerald cut 0.78 ct

Alexandrite in emerald cut with colour change. Size 6.10 x 4.39 mm

EUR 8,590
Incl. VAT and free shipping

 
Precious jewellery is a matter of trust!

RenéSim is your online jeweller with 180 years of family tradition. We are happy to provide personal advice – we work with you to create the perfect piece of jewellery for all occasions. Simply contact us.

+44 20 351 466 05Call us from Monday to Friday, 9 am – 7 pm

Alexandrite emerald cut 0.8 ct Alexandrite emerald cut 0.8 ct

Alexandrite in emerald cut with colour change. Size 6.14 x 4.37 mm

EUR 8,790
Incl. VAT and free shipping

 
Alexandrite emerald cut 0.91 ct Alexandrite emerald cut 0.91 ct

Alexandrite in emerald cut with colour change, size 6.11 x 4.51 mm

EUR 12,900
Incl. VAT and free shipping

 
Alexandrite emerald cut 0.91 ct Alexandrite emerald cut 0.91 ct

Alexandrite in emerald cut with colour change, size 6.18 x 4.55 mm

EUR 12,900
Incl. VAT and free shipping

 
Alexandrite emerald cut 0.95 ct Alexandrite emerald cut 0.95 ct

Alexandrite in emerald cut with colour change, size 6.54 x 4.71 mm

EUR 13,490
Incl. VAT and free shipping

 
Alexandrite emerald cut 0.98 ct Alexandrite emerald cut 0.98 ct

Alexandrite in emerald cut with colour change, size 7.23 x 5.21 mm

EUR 14,900
Incl. VAT and free shipping

 
Alexandrite antique cut 0.62 ct Alexandrite antique cut 0.62 ct

Alexandrite in antique cut with colour change. Size 5.96 x 4.72 mm

EUR 1,590
Incl. VAT and free shipping

 
Precious jewellery is a matter of trust!

RenéSim is your online jeweller with 180 years of family tradition. We are happy to provide personal advice – we work with you to create the perfect piece of jewellery for all occasions. Simply contact us.

+44 20 351 466 05Call us from Monday to Friday, 9 am – 7 pm

Alexandrite antique cut 1.37 ct Alexandrite antique cut 1.37 ct

Alexandrite in antique cut with colour change, size 8.65 x 6.40 mm

EUR 12,490
Incl. VAT and free shipping

 

Alexandrite - emerald green by day, ruby red by night

The Alexandrite effect – a dazzling play of colours in daylight and artificial light

The characteristic feature of an alexandrite gemstone is its ability to change colour depending on the type of ambient light. In natural daylight alexandrites appear in shades of emerald to bluish green, while under artificial light or candlelight the stones change to show their complementary colour and take on a ruby-red, raspberry red or purple appearance. The technical term for this phenomenon, which gave rise to the expression "emerald green by day, ruby red by night“, is pleochroism. It is caused by traces of chromium.
Unfortunately, alexandrites which display this effect strongly and show intense colour changes are extremely rare. The first alexandrite deposits to be discovered were found in emerald mines in the southern Ural mountains in 1830 and were a rich source of these rare gems; however, they were exhausted after only a few decades.
Pleochroism is less obvious in alexandrites from other regions such as Sri Lanka, which change from blue-green to violet.
However, as luck would have it a new source of extremely high-quality alexandrite gems, was discovered in 1987, in the town of Hematita in the Brazilian state of Minas Gerais.

Alexandrite and its origins

Alexandrite was formed millions of years ago when two different types of rock containing aluminium, beryllium and chromium came together - a very rare occurrence. Given this, alexandrite is an extremely rare stone.
The Finnish mineralogist Nils Gustaf Nordenskjöld (1792-1866) discovered the first alexandrite in 1830 and named it after the future Tsar Alexander II (1818-1881). The stone thus became known in Russia as the gem of the Tsars.

Alexandrite and its characteristics

Alexandrite is a variety of chrysoberyl and is the third hardest known mineral, with a hardness of 8.5 on the Mohs scale.
While inclusions are common in many alexandrite gems, they do not reduce the value of the stones. Quite the opposite, in fact - they actually serve as proof that the gem is a unique natural product. Nevertheless, the most highly prized alexandrite gems are also the most transparent and translucent.

Cat's eye alexandrites

Cat's eye alexandrites are primarily found in Tanzania. The special feature of these fascinating gems is a shimmering luminous band crossing their surface, a phenomenon known as chatoyance. The stone takes its name from the resemblance to a cat's eye, with its narrow pupil, which glows in the dark.

You may also be interested in the following:

Here is an overview of the coloured gemstones you can purchase from RenéSim: Gemstones - From amethyst to tourmaline.

Or are you interested in a ruby? We have collected fascinating background information about rubies for you: Ruby.

Perhaps you seek white diamonds? Our diamond database offers loose diamonds - also for jewellery.

At RenéSim you will find beautiful engagement rings, all of which can be personalised: Unique engagement rings.

     
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    As an online jeweller, RenéSim combines the benefits of a modern online-based business model with 180 years of family-run traditional craftsmanship in the jewellery industry. Gemstones such as diamonds are the central focus at RenéSim; we supply high-quality, thoroughly individual pieces such as engagement rings in addition to loose diamonds. We offer unique diamond post earrings, diamond rings, memory rings, engagement rings and much more. Consult the jewellery experts at RenéSim!

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