Our Gemstones

KORABA - A World of Natural Gemstones


Koraba Jewellery offers a full range of jewellery made with both the fossilized resin amber and semiprecious and precious gemstones, in a world of colors.


Baltic Amber and Caribbean Amber 


In our jewellery we use mainly Baltic Amber, found in Poland and Germany, known as the “treasure of the eastern European Sea”, as well as amber from the Caribbean Sea.

Caribbean amber is a younger amber, that differentiates itself from Baltic amber by being nearly always transparent. Because of the tropical environment of where it is found, it also has 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



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



Cornelian 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



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