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Cut loose gemstones

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Adular/moonstone

Adular/moonstone is today one of the most precious gems, thanks to a unique appearance that is best described as a luminous foggy moon. Gemologists call this phenomenon adularescence. This gentle fluorescence of the stone is caused by the small inclusions of various metals and chemical compounds with different refractive indices. Individual layers of inclusions and incident rays create the impression of colors and lights as if they were coming from within the gem.
In addition to the famous Swiss mines, lunar stones are also collected in Sri Lanka or India. Monthly stones from Sri Lanka have the most beautiful colorful luminous inclusions and are among the most precious varieties of this gem. In India, interesting rainbow lunar stones with the inclusion of a whole spectrum of colors are found.

MOONSTONE (ADULAR)
COLOR:  WHITE TO WHITE, BLUE, GRAY, BEIGE OR YELLOW
CHEMICAL COMPOSITION: POTASSIUM ALUMINUM
CRYSTALLOGRAPHIC SYSTEM:   SINGLE-CLASS
TVRDOSTHARDNESS: 6 (MOHS´ES)
RELATIVE DENSITY: 2.55 - 2.61

Aquamarine

Aquamarine is a hexagonal mineral, beryllium silicate (chemical formula Be3Al2Si6O18). The name of the mineral is derived from the Latin aa marina (sea water).

Like the sea level, aquamarine can have different shades of blue, from light tones to green tones to dark blue. The louder the blue tone, the higher the aquamarine value. Most aquamarines, however, have the characteristic light blue color, which is paradoxically the most sought after in the jewelery industry.

Identification:
Color blue
Crystal appearance prismatic
The system is hexagonal
Hardness 7.5 - 8
Glass glossy, matt
The cleavage is imperfect
Scratch white
Density 2.6 - 2.8 g / cm³

Natural alexandrites with GIA certificate

Alexandrite

Alexandrite is one of the most precious gemstones and is the rarest variety of chrysoberyl mineral, Russia's national gem. It was discovered relatively late, on April 17, 1834 by the Finnish mineralogist N. Nordenskjöld in the Emerald Mines of the Urals.

Identification:
Color: yellow to emerald green, blue-green, gray-brown
System: rhombic
Hardness: 8.5
Glossy: glassy
Cleavage: distinct according to {110}
White scratch
Density: 3,75 g⋅cm − 3
Other: strong pleochroism

Amethyst

Amethyst is a mineral, a variety of quartz of various shades of purple color. Amethyst is counted among precious stones, is a favorite material for making various ornaments and jewelery. It is mainly found in the cavities of basic rocks (geodes). Amethyst has a color from purple to purple. Some amethysts are transparent, others are translucent, other opaque, opaque. Because of their color they are very popular.

Amethyst is one of the most precious gems of the mineralogical group of quartz, and its purple hue is due to the trace amounts of iron and aluminum. Purple color has been considered one of the symbols of the royal status since time immemorial, so amethyst has become part of a number of coronation jewels.

The jewelery has been of amethyst since ancient times. Amethyst beads are known from the ancient civilizations of Mohendzhador, Egypt, Sumer, and Baktrie in Afghanistan and Tajikistan.

Identification:
Color violet
Crystal appearance of columnar, hexagonal crystals
The cranial system
Hardness 7
Glossy glass
Scarcity dishonest
Refractive index 1.54 (o) / 1.55 (e)
Scratch white
Density 2.6 g / cm³
Solubility of hydrofluoric acid
Other uneven or lasting quarry

garnet

Garnet

As grenades (Hagones, 1250) we refer to the group of cubic minerals, non-silicates with a complicated chemical formula of the general form X3Z2 [SiO4] 3. The name comes from the Latin granatum malum - pomegranate. They generally consist of rhodododecahedric and hexaoctoedric crystals. Grained and compact aggregates are less common. There are individual grains or smoothed pebbles in the alluviums. The most famous varieties include Almandin, Grosular (light green to amber or deep brown), Hesonit (variety of grosular, honey yellow), Pyrope (blood red to black), Spessartin (dark red to brownish red), Uvarovit (emerald green). The most precious are the pyropes with the color change effect of alexandrite, in daylight and artificial lighting, very expensive are emerald green tsavorites from Tanzania, demantoids from Russia, cheaper are orange spessartins, sought after is rhodolite, rhodolith garnet, pyralmandine is a mixture of pyrope and almandine. raspberry colors. Indians and Romans used to use abundantly grosular, orange to honey hesonit, because they believed that he would turn away evil, gomedha stone, gomeda.

Color: different according to varieties
Appearance of crystal: rombododekaedry, hexaoctoedry
System: cubic
Hardness: 6.5–7.5
Gloss: glassy, ​​matt, silk
Fission: imperfect
Engraving: white with color accents
Density: 3,4–4,6 g⋅cm − 3

Chrysoberyl

The name consists of the Greek words χρυσός (chrysos) = golden and βήρυλλος (berylos) = beryl, which describe the color of the mineral.
Despite the similarity of names - chrysoberyl and beryl, they are two completely different gems, although both contain beryllium. Chrysoberyl is the third hardest, frequently occurring natural gem and lies at 8.5 on the Mohs mineral hardness scale, between corundum (9) and topaz (8). Ordinary chrysoberyl is yellowish green and transparent to translucent. If the mineral has a good light green to yellow color and is transparent, it is used as a gem.

Identification
Color: yellow, light green
System: diamond
Hardness: 8.5
Gloss: vitreous, greasy
Good cleavage
White scratch
Density: 3,7 g⋅cm − 3
Solubility in acids: insoluble

Spinel

Spinel is a cubic mineral belonging to the spinelids group.
The name probably comes from the Latin spina - ton, according to sharp octahedral crystals.

Spinels, however, offer the same variety of colors as sapphires. The historically oldest spinel site was the giant infusions of Sri Lanka. Around 500 BC the first Badakhshan, now Tajik pink to wine spinels, may have been found, admired by the Persian kings and saves. Around 1000 AD the extraction of these spinels from the Pamira and Hindukse intersections has grown, and from there a balanced spinel is also adorned with many distinguished European jewels. Spinel is softer than corundum, but it is a beautiful stone, healers are very protective, and he enjoyed great popularity in India.

Identification:
Color blue, yellow, green, red, salmon, purple, ...
Appearance of octahedral crystal, dodecahedron
The cubic system
Hardness 8
Glossy glass
Scarcity dishonest
Refractive index 1,712-1,762
Gray gray
Density 3.57-3.72 g / cm³

Opal

Sinhalite

Sinhalite is a borate mineral with the formula MgAl (BO4), hardness 6.5 - 7 Mohs scale.
This precious gem was first discovered in Sri Lanka (Ceylon) in 1952 and was named after its site - "Sinhala", which is the Sanskrit name for Sri Lanka. (Burma) The most common color of Sinhalite is white to gray, gray-blue or various shades of brown - from light to dark, and more rare are the shades of yellow.

Tourmaline

Tourmalines are complex borosilicates of aluminum and many other elements, mainly sodium, iron, magnesium or lithium. In nature, these elements in the crystal structures of tourmalines are represented in a variety of ways. Today the chemical composition distinguish 14 kinds of tourmaline (schorl, dravite, ELBAITE, welcome liddicoatit, buergerit, feruvit, chromdravit, foitit, magnesiofoitit, olenit, povondrait, rossmanit, vanadiumdravit). These are mixed with each other, so the correct assignment of a sample of turmaline to a particular species is usually possible only after a thorough chemical analysis, according to the predominant component. The chemical composition of tourmaline often changed during its growth. Tourmalines commonly have different chemical composition in the middle of the crystal and others at its edges, or differ in chemical composition at the ends of the columnar crystal and in the middle of the column. The most widespread tournaments are scorching, starving and elbait. Perfectly combines the lead with the predator (so-called skoryl-dravitová) and the skull with the elbaite (a series of skoryl-elbaitová).
Tourmaline forms acicular and columnar crystals longitudinally grooved in cross-section triangular or hexagonal, or stébelnaté forms, acicular or even felty aggregates. Tourmalines are glass-glossy to matt, on uneven to last-lasting fracture they are vitreous to greasy. They are transparent, translucent to opaque. Most common are black, brown, dark green, dark blue, or pink, red, light green, light blue, etc.

Sapphire

Sapphire (Hebrew name) is a mono-crystal of alumina (Al2O3), a mineral called corundum. Whilst corundum consists of pure alumina, the sapphires always contain a mixture of other elements (iron, chromium, copper, magnesium, etc.) that supply it with blue, red, yellow, pink, purple, orange or greenish color. Among the sapphires are all gems, which are corundum varieties except red - also called ruby.

Sapphires are characterized by a variety of shapes and processing. The most precious are the oval shapes in which the star effect of the gem stones. Fancy and Emerald Shapes are also common. For less pure sapphires, the shape of the kaboson is used.

Identification:
Color blue, orange, pink, yellow, green,
white or multicolored
The cranial system
Hardness 9
Glossy glass
No cleavage
Refractive index 1.762-1.778
Scratch white
Density 3.95-4.03 g / cm³
Solubility insoluble

Emerald

Emerald, the chemical formula Be3 (Al, Cr) 2Si6O18 (beryllium aluminosilicate), is a hexagonal mineral. Emerald is the best known and most valuable variety of the mineral beryl. The most famous and valuable - thanks to its unmistakable deep green color - are the emeralds from Colombia. Other important sites include Brazil, Zambia, Namibia and Russia. Green color Prismatic crystal appearance Six-system system Hardness 7.5 - 8 Glassy, matt gloss Fission is imperfect White scratch Density 2.6 - 2.8 g⋅cm − 3 Solubility in HF

Ruby

Ruby is a pink to red gem consisting mainly of corundum (Al2O3) mineral with chromium coloring. The degree of hardness on the Mohs scale is 9. Among the largest deposits of rubies are mainly Africa, Asia (Burma), Australia, Greenland, Madagascar. The oldest deposits of rubies are alluvial rivers of southwestern Sri Lanka (Kaliganga River) with the old center of Ratnapura. Rubies are in demand magical and jewelry minerals. Their color is orange-red, raspberry, faint red, deep red, red, like blood - also known as "pigeon blood" - so colored rubies are the most precious! Ruby is one of the most valuable gemstones whose value can sometimes even exceed the price of roughly equal diamonds.

Color: red
Crystal appearance: often six-prisms
System: sixth
Hardness: 9
Gloss: glassy
Engraving: white
Density: 4 g⋅cm − 3
Others: high thermal conductivity

Topaz

Topaz was named after the legendary island of Topazios, which lies on the coast of Egypt, or the Sanskrit word 'tapas', which means heat or fire. Topaz excels in an exceptionally wide color scheme, which, besides the classic brown, includes various saturated shades of blue, green, yellow, orange, red, pink and purple.


Identification:

Color clear, wine yellow, honey, pink, brownish, bluish
The appearance of the crystal is stretched in column
crystals
The diamond system
Hardness 8
Glossy glass
Scatter by base
Refractive index ??
Scratch white
Density 3.5 - 3.6 g / cm³

Zircon

Zircon, zirconium (zirconium silicate) is a square mineral. The name derives from the Persian zargun - colored as gold, according to the color of one of the varieties. Zircon is the oldest known mineral on Earth (in relation to the age of the Earth, not to human knowledge); Most often occurs in the form of tabular to prismatic crystals, with a square cross-section, terminated by a quadrilateral pyramid

Color: colorless, yellow, green, blue ...
Crystal appearance: prismatic, dipyramidal
System: square
Hardness: 7.5
Gloss: Diamond
Fission: imperfect
Engraving: white
Density 4,6–4,7 g⋅cm − 3

Alexandrite - 1,6 ct

Rare natural ALEXANDRITE - TOP QUALITYGIA certificateWeight: 1.6 ctDimensions: 7.13 x 6.51 x 3.85 mmColor:...
Kč65,000.00

Alexandrite - 1,06 ct

Rare natural ALEXANDRITE - TOP QUALITYGIA certificateWeight: 1.06 ctDimensions: 6.14 x 5.63 x 2.70 mmColor:...
Kč72,000.00

Alexandrite - 1,62 ct

Rare natural ALEXANDRITE - TOP QUALITYGIA certificateWeight: 1,62 ctDimensions: 7.42 x 6.68 x 3.82 mmColor:...
Kč69,000.00

Unique Alexandrite - 2,06 ct

Rare natural ALEXANDRITE - TOP QUALITY With ,,silk" inclusions, remind cat´s eye effectGIA certificateWeight: 2.06...
Kč155,000.00

Alexandrite - 4,57 ct - TOP!!

RARITY - rare natural ALEXANDRIT - TOP QUALITYGIA certificateWeight: 4.57 ctDimensions: 10.43 x 9.27 x 6.02 mmColor:...
Kč363,000.00

Alexandrite - 0,63 ct

Rare natural ALEXANDRIT - TOP QUALITYGIA certificateWeight: 0.63 ctDimensions: 6.0 x 4.3 x 2.7 mmColor: green /...
Kč30,000.00

Alexandrite - 1,40 ct

Rare natural ALEXANDRITE - TOP QUALITYGIA certificateWeight: 1.40 ctDimensions: 7.7 x 6.2 x 4.1 mmColor: green /...
Kč72,000.00

Alexandrite - 1,02 ct

Precious natural alexandriteGIA certificateWeight: 1.02 ctDimensions: 6.60 x 6.42 x 3.22 mmColor: green / pink...
Kč29,000.00

Alexandrite - 1,11 ct - TOP!

Precious natural alexandriteGIA certificateWeight: 1.11 ctDimensions: 6.57 x 5.96 x 3.57 mmColor: green / pink...
Kč42,000.00

Sapphire - 0,74 ct

Natural SAPPHIREGIA certificateWeight: 0.74 ctDimensions: 5.9 x 4.9 x 2.9 mmColor: green (unheated)Shape: oval mixed...
Kč7,000.00

Sapphire - 1,56 ct

Natural SAPPHIREGIA certificateWeight: 1.56 ctDimensions: 8.61 x 5.68 x 4.87 mmColor: blue-violet (unheated)Shape:...
Kč26,000.00

Sapphire - 0,71 ct

Natural sapphireGIA certificateWeight: 0.71 ctDimensions: 6.0 x 4.8 x 3.0 mmColor: blue (unheated)Shape: oval mixed...
Kč10,000.00

Sapphire - 0,85 ct

Natural sapphireGIA certificateWeight: 0.85 ctDimensions: 6.30 x 4.82 x 3.04 mmColor: blue (unheated)Shape: oval...
Kč11,000.00

Sapphire - 1,55 ct

Natural sapphireGIA certificateWeight: 1.55 ctDimensions: 7.3 x 7.0 x 4.3 mmColor: blue (heated)Shape:...
Kč29,000.00

Sapphire - 0,99 ct

Natural sapphireGIA certificateWeight: 0,99 ctDimensions: 5.9 x 5.8 x 3.8 mmColor: blue (heated)Shape: round briliant...
Kč18,000.00

Sapphire - 1,47 ct

Natural sapphireGIA certificateWeight: 1.47 ctDimensions: 6.9 x 6.9 x 3.9 mmColor: blue (heated)Shape: round briliant...
Kč34,000.00

Sapphire - 1,30 ct

Natural sapphireGIA certificateWeight: 1.30 ctDimensions: 6.79 x 5.25 x 4.13 mmColor: yellow (unheated)Shape: oval...
Kč15,500.00

Sapphire - 0,79 ct

Natural sapphireGIA certificateWeight: 0.79 ctDimensions: 5.81 x 4.47 x 2.80 mmColor: yellow (heat treated)Shape:...
Kč6,000.00

Sapphire - gemstone

Natural sapphireGIA certificateWeight: 0.90 ctDimensions: 6.67 x 4.76 x 2.41 mmColor: orange (heat treated)Shape:...
Kč11,000.00

Sapphire - 0,93 ct

Natural sapphireGIA certificateWeight: 0.93 ctDimensions: 6.45 x 5.33 x 2.81 mmColor: yellow (unheated)Shape:...
Kč5,000.00

Sapphire blue - 2.12 ct...

Beautiful natural sapphireGIA certificateWeight: 2.12 ctDimensions: 8.0 x 6.6 x 4.3 mmColor: blue (unheated)Shape:...
Kč48,000.00

Sapphire - 2,05 ct

Natural sapphireGIA certificateWeight: 2.05 ctDimensions: 8.3 x 6.3 x 4.4 mmColor: yellow-green (unheated)Shape:...
Kč25,000.00

Sapphire - 1,50 ct

Natural sapphireGIA certificateWeight: 1.50 ctDimensions: 7.1 x 5.6 x 3.9 mmColor: yellow (unheated)Shape: oval mixed...
Kč8,000.00

Sapphire - 1,03 ct

Natural sapphireGIA certificateWeight: 1.03 ctDimensions: 5.8 x 5.5 x 4.2 mmColor: yellow (unheated)Shape: oval mixed...
Kč5,200.00

Sapphire - 1,60 ct - TOP

Natural sapphire, beautiful blue colourGIA certificateWeight: 1.60 ctDimensions: 7.4 x 6.0 x 4.2 mmColor: blue (heat...
Kč30,000.00

Sapphire - 0,71 ct

Natural sapphireGIA certificateWeight: 0.71 ctDimensions: 6.2 x 4.3 x 2.8 mmColor: blue (unheated)Shape: oval mixed...
Kč11,000.00

Sapphire - 1,20 ct - TOP

Natural sapphire - beautiful blue colorGIA certificateWeight: 1.20 ctSize: 6.8 x 6.6 x 3.1 mmColor: blue...
Kč25,000.00

SAPPHIRE PADPARADSCHA -...

Natural rare sapphire - type "PADPARADSCHA"GIA certificateWeight: 1.05 ctDimensions: 6.37 x 5.17 x 3.21 mmColor:...
Kč36,000.00

SAPPHIRE PADPARADSCHA -...

Natural rare sapphire - type "PADPARADSCHA"GIA certificateWeight: 0.88 ctDimensions: 6.86 x 4.71 x 3.01 mmColor:...
Kč25,000.00
Tourmaline
  • -20%
  • -20%

Tourmaline

Natural tourmalineGIA certificateWeight: 1.67 ctDimensions: 6.84 x 6.11 x 4.85 mmColor: chrome-green (unheated)Shape:...
Kč18,400.00 Kč23,000.00

Tourmaline - 1,9 ct

Natural tourmalineGIA certificateWeight: 1.90 ctDimensions: 8.08 x 5.59 x 4.25 mmColor: chrome-green (unheated)Shape:...
Kč25,000.00

Tourmaline - 1,9 ct

Natural tourmalineGIA certificateWeight: 1.90 ctDimensions: 8.35 x 6.20 x 4.66 mmColor: green (unheated)Shape:...
Kč6,000.00

Tourmaline - 0,83 ct

Natural tourmalineGIA certificateWeight: 0.83 ctDimensions: 5.29 x 5.36 x 3.90 mmColor: yellow (unheated)Shape: round...
Kč2,500.00

Tourmaline - 1,42 ct

Natural tourmalineGIA certificateWeight: 1.42 ctSize: 6.93 x 6.96 x 4.19 mmColor: yellow (unheated)Shape: round mixed...
Kč4,000.00

Spinel - 1,22 ct

Natural spinelGIA certificateWeight: 1.22 ctDimensions: 7.97 x 5.78 x 4.23 mmColor: blue-green (unheated)Shape:...
Kč7,000.00

Spinel -1,41 ct

Natural spinelGIA certificateWeight: 1.41 ctDimensions: 7.13 x 6.65 x 3.96 mmColor: dark blue (unheated)Shape: round...
Kč11,000.00

Spinel - 1,35 ct

Natural spinelGIA certificateWeight: 1.35 ctDimensions: 6.98 x 5.68 x 4.87 mmColor: blue-green (unheated)Shape:...
Kč9,000.00

Spinel - 4,35 ct - TOP

Natural spinel - TOP quality - a rarity!GIA certificateWeight: 4,35 ctDimensions: 11.10 x 8.86 x 6.09 mmColor:...
Kč120,000.00

Spinel - 4,27 ct - TOP

Natural spinel - TOP quality- a rarity!GIA certificateWeight: 4.27 ctDimensions: 11.28 x 8.86 x 5.10 mmColor: purple...
Kč96,600.00

Spinel - 1,17 ct

Natural spinelGIA certificateWeight: 1.17 ctSize: 6.97 x 6.49 x 3.82 mmColor: violet (unheated)Shape: round mixed...
Kč5,000.00

Spinel - 1,37 ct

Natural spinelGIA certificateWeight: 1.37 ctDimensions: 6.38 x 6.46 x 4.65 mmColor: violet (unheated)Shape: round...
Kč8,000.00

Spinel - 2,00 ct

Natural spinelGIA certificateWeight: 2,00 ctDimensions: 8.09 x 6.97 x 4.82 mmColor: violet (unheated)Shape: oval...
Kč12,000.00

Spinel - 1,26 ct

Natural spinelGIA certificateWeight: 1.26 ctDimensions: 6.23 x 6.40 x 3.99 mmColor: violet (unheated)Shape:...
Kč5,500.00

Spinel - 2,18 ct

Natural spinelGIA certificateWeight: 2,18 ctDimensions: 8.08 x 6.88 x 5.00 mmColor: blue-green (unheated)Shape: oval...
Kč18,000.00

Spinel - 0,98 ct

Natural spinelGIA certificateWeight: 0.98 ctDimensions: 6.11 x 6.19 x 3.46 mmColor: pink (unheated)Shape: round...
Kč3,600.00

Spinel - 1,27 ct

Natural spinelGIA certificateWeight: 1.27 ctSize: 7.56 x 5.26 x 4.26 mmColor: purple (unheated)Shape: oval mix...
Kč7,300.00

Sapphire asterisk beautiful...

Natural star sapphire - beautiful pink-violet colorGIA certificateWeight: 1.99 ctSize: 7.5 x 5.5 x 4.7 mmColor:...
Kč36,000.00

Star sapphire - 3,36 ct

Natural star sapphireGIA certificateWeight: 3.36 ctDimensions: 8.91 x 8.99 x 3.94 mmColor: light violet...
Kč28,000.00

Star sapphire - 10,06 ct

Natural star sapphireGIA certificateWeight: 10.06 ctDimensions: 12.1 x 10.5 x 7.6 mmColor: pink-violet...
Kč76,000.00

Star sapphire - 2,76 ct

Natural star sapphireGIA certificateWeight: 2.76 ctSize: 7.64 x 7.42 x 4.31 mmColor: purple (unheated)Shape: oval...
Kč16,000.00

Sapphire star asterisk...

Natural star sapphire - beautiful colorGIA certificateWeight: 3.67 ctDimensions: 7.20 x 7.12 x 6.2 mmColor: blue...
Kč33,000.00

Star sapphire blue - 4,15...

Natural star sapphireGIA certificateWeight: 4.15 ctDimensions: 9.87 x 7.67 x 5.31 mmColor: blue (unheated)Shape: oval...
Kč39,000.00

Star sapphire - 7,06 ct

Natural star sapphireGIA certificateWeight: 7.06 ctDimensions: 9.56 x 8.36 x 8.12 mmColor: light gray...
Kč49,000.00

Star sapphire - 9,24 ct

Natural star sapphireGIA certificateWeight: 9.24 ctDimensions: 12.07 x 9.38 x 7.68 mmColor: blue (unheated)Shape:...
Kč75,000.00