Our Gemstones

KORABA - A World of Natural Gemstones


Koraba Jewellery offers a full range of jewellery made with semiprecious and precious gemstones.


Amber is the most common semiprecious stone used in our jewellery. Usually devided in the two cathegories, Baltic Amber, found in Poland and Germany, known as the “treasure of the eastern European Sea”, as well as Caribbean amber, from the Caribbean Sea.


Caribbean amber is the youngest resin of the two, and differentiates itself by the transparent appearance. The tropical environment of where it is found, also gives the stones a higher number of fossil inclusions.


The colors of the Baltic Amber range from a milky white color to light clear honey, yellow, cognac and cherry. Whereas the Amber from the Caribbean Sea, typically have greener and bluer color tones.



Amber is a fossilized tree resin, which has been appreciated for its color and natural beauty since Neolithic times. It’s is highly valued from the antiquity to the present time as a gemstone, used in both decorative items and jewellery.

Mineral class: Amber is not a mineral, but a fossilized resin

Colors: Yellowish orange (cognac), cherry, green, white



The White Amber, often referred to as Royal Amber, is the only amber that has not been heat treated to obtain its form and appearance.

Mineral class: White Amber is not a mineral, but a fossilized resin

Color: Milky White


Natural Gemstones



Agate is a semi-precious silica mineral, a variety of chalcedony (quartz) typically banded in appearance with varying color and transparency.

Mineral class: Calcedony variety

Colors: Brown, White, Black, Grey, Red, Pink, Green, Yellow (banded)



The blue color in Agate Aqua is most often received through dyeing, although some blue agate occurs naturally.  

Mineral class: Calcedony variety

Color: Blue



The blue color in Agate Blue is most often received through dyeing, although some blue agate occurs naturally.  Holley Blue Agate and blue lace agate is some of the naturally blue agate stones. 

Mineral class: Calcedony variety

Color: Blue



Agate Fuchsia has been dyed to create its amazing vivid and pinkish purple color. 

Mineral class: Calcedony variety

Color: Fuchsia| Pink 



Agate Green is a wonderful emerald green gemstone that can be found naturally, but is also achieved through dyeing. The color of the stone makes it very versatile and sought after to be used in jewellery.   

Mineral class: Calcedony variety

Color: Green 



Amazonite also called Amazonstone, got its name after the Amazon river where these green stones where formerly found. It is a green tectosilicate mineral, where the green and greenish-blue varieties of potassium feldspar are designated as amazonite. 

Mineral class: Tectosilicate

Color: Green, Blue-green 



Green Amethyst, also called Prasiolite, is a rare stone in nature. Artificially produced green amethyst is heat treated amethyst.

Mineral class: Quartz

Colors: Green



Amethyst is a transparent coarse-grained variety of the silica mineral quartz. It is valued as a semiprecious gemstone for its violet color.

Mineral class: Quartz

Color: Violet



Aventurine is a form of quartz, characterized by its translucency and Plath mineral inclusions that give a shimmering or glistering effect. The most common color of aventurine is green, but it may also be blue, yellow, orange, grey and brow.  

Mineral class: Chalcedony 

Color: Green, Blue, Yellow, Orange, Grey, Brown. 



Carnelian is a brownish-red mineral of the silica mineral chalcedony, colored by impurities of iron oxide, commonly used as a semi-precious gemstone.

Mineral class: Chalcedony

Colors: Red, Orange



Labradorite got its name from where it was first found, in Labrador, a Canadian province on the Isle of Paul. Labradorite is a plagioclase mineral that is known for its brilliant flashes of color, caused by lamellar twinning inside the crystal.

Mineral class: Plagioclase minerals / Adularescence, tectosilicate  

Colors: Grey to blue with green and blue flashes



Mixed gemstones is basically a mix of our best gemstones, often called harlequin jewellery because of the multicolored vision.  

Mineral class: A mix of minerals

Colors: Multicolored



Onyx is a gemstone most commonly described as a solid black chalcedony, that is parallel banded or layered, with black and white color. In its solid form Onyx is the most traditional black gemstone.  

Mineral class: Chalcedony    

Colors: White, Black (parallel banded)



Lemon Quartz is a lemon-yellow variety of color-enhanced transparent quartz, sometimes referred to as “Oro Verde”. Lemon quartz obtains its brilliant sparkling color through an artificial gamma-ray irradiation process, followed by a mid-heat treatment.

Mineral class: Quartz

Colors: Lemon-yellow



Rose Quartz is the name used for pink versions of the mineral quartz. The pink color of rose quartz is attributed to microscopic inclusions of a pink variety of the mineral dumortierite. These inclusions are usually abundant enough to make the rose quartz translucent instead of transparent.

Mineral class: Quartz

Color: Pink



Tiger Eye, also called Tiger’s Eye is a very popular quartz gemstone that is usually a metamorphic rock with a golden to red-brown color. After the stone has been cut and treated, and achieved its silky hue, it looks like a cat eye, hence the name. 

Mineral class: Quartz 

Color: Golden to red-brown 



Topaz is a silicate mineral of aluminium and fluorine. The blue topaz is quite rare, as the stone usually occurs colorless, grey or pale yellow and blue. The material is irradiated to produce the more desired blue and dark blue.

Mineral class: Topaz

Color: Blue



Turquoise is an opaque, blue-to-green mineral, that is a hydrated phosphate of copper and aluminium. It is a rare and valuable stone in its finer grades and has been valued as a gemstone for thousands of years due to its unique hue.

Mineral class: Phosphate

Colors: Turquoise, Blue, Blue-green and Green



Zircon is a precious gemstone, sometimes looked upon as a less expensive diamond, but in actuality it can be a valuable gem, that varies in color. Most zircon is heat treated to enhance their natural color and achieve its transparent and pure finish.  

Mineral class: Zircon

Color: White, Colorless, Blue, Red, Green, Yellow, Orange, Brown, Pink, Purple, Grey