Rough Gemstones, Rough Quartz

We sell rough gemstones, essentially all the varieties of rough stones in the quartz family from Brazil, and our rough stones are warehoused in Bangkok, Thailand from where we can export rough or cut stones as per our customers' specifications. We also sell preforms in large quantities.

Quadrature
Jewelry Manufacturing
Thailand.
( French - English )

Please contact us to recieve our price list

See the actual stock and reference code numbers at the bottom of this page.

1. Green Amethyst, 2. Geen Amethyst, 3. Gold Green Quartz, 4. Rose Quartz,
5. Amethist Maraba, 6. Lemon Quartz, 7.Champagne Quartz, 8 Honey Quartz, 9. Cognac Quartz

We can eventually supply other varieties of rough gemstones like spinel or rhodolite garnet from East-Africa. For such request please contact us directly to discuss about your needs. We do not stock valuable rough stones in Bangkok and we prefer to consolidate orders directly from the mine.

Our prices can change every 1 or 2 months with new arrivals from the mines. Each time prices are re-evaluated depending on the rough availability, the dollars rate, etc.
Our prices on the local market in Thailand are generally a little bit lower than our prices for export since exporting the rough material requires more administrative paperwork and presents more risks as well.
At the end, the VAT is bringing balance in all this but please always specify where you are located and where you expect the goods to be sent, when asking for a price list..

ACTUAL STOCK AVAILABLE

#4	Gold Green	Big
#5	Gold Green	Medium
#7	Gold Green	Medium	Sliced
#9	Citrine Quartz (treated)	Medium	Sliced - brownish
#10	Citrine Quartz (treated)	Small	Sliced - Yellow
#11	Cognac Super A	Small
#12	Cognac Super A	Medium
#13	Champagne Quartz	Medium	Sliced - Long crystals
#14	Rose Quartz	Big
#15	Champagne Quartz	Medium	Sliced
#16	Quartz Rutile black needles	Big
#18	Rose Quartz	Small
#20	Rose Quartz	Small	Sliced
#21	Rose Quartz Milky	Big
#22	Green Amethyst A	Medium	Medium color n°6
#23	Green Amethyst B	Medium	Medium-Light color n°4
#24	Smoky Quartz	Medium-Big
#25	Amethyst B	Small	Dark color
#30	Citrine A	Medium	Dark Color
#32	Opal B	Medium	Orange (Fire Milky)
#34	Cognac Super A	Medium
#36	Amethyst Beads quality	Small	Dark Color

ROUGH STONES	SIZES
Green Amethyst	Color grade 2/10
Green Amethyst	Color grade 4/10
Green Amethyst	Color grade 6/10
Green Amethyst	Color grade 8/10
Green Amethyst	Color grade 10/10

ROUGH STONES

Honey Quartz Medium Color

Honey Quartz Strong Color

ROUGH STONES	SIZES	PREPARATION	PRICE	Stock
Rutile Quartz	10 to 30g	Clean, Sliced	On Request	100 kg

About the Quartz family:

The name quartz comes from the German miners' language used during the Middle Age, but its meaning is still not understood.
Quartz is a silicon dioxide and its chemical formula is SiO2. It crystallizes in the trigonal system and has no less than 8 polymorphs (i.e. crystals having the same chemistry but a different internal structure), but, contrary to quartz, are extremely rare and need high temperature and/or pressure condition to be stable. Quartz belongs to the silica group which is a subdivision of the (tecto) silicate class.
Habits are usually a 6-faces prism ended by pyramid but can also be tabular, or show a druse or massive form. Horizontal striae are an important characteristic and are due to the vibration during the crystal growth. It often presents twinning. Crystals are generally important and some pieces bigger than a human-being can be found (Brazil). Quartz has a hardness of 7 on Mohs' scale, where it is a standard-reference and so an important boundary in gemology. In a matter of fact, many of the dust particles in the air are also quartz. So a gem has to be hard enough (i.e. having a hardness equal or higher than 7 to resist abrasion if is daily worn).
Quartz has some attractive properties, which are used by industries as optical lenses, electrical components, for example.
Quartz is, after the feldspar, the most common mineral on the crust part of Earth (13%) and is the principal component of magmatic, metamorphic acid rocks and sandstone.
Quartz is an important family and shows an amazing variety of colors and forms. It is subdivided into 2 categories: macrocrystalline and cryptocrystalline quartz.

Macrocrystalline means "large crystals". Many varieties are well known, popular and show a nice clarity and color.
Amethyst is the violet common-quartz variety used in jewelry owns its color to color centers.
Citrine is the yellow to orange quartz variety. Most of the stones in the market are in fact resulting from the heat treatment of amethysts.
Smoky quartz is the brown variety, rock crystal the colorless.
Quartz is also very rich in inclusions and more than 200 different minerals were identified only in European Alps specimens. Rutilated quartz is may be the most famous and researched: It holds beautiful yellow rutile needles. Aventurine shows aventurescence tue to small reddish platelets of hematites randomly distributed within the stone.
Quartz are also the variety showing phenomena like the chatoyancy in the "tiger's eye" for example. This particular stone is interesting as quartz in fact had replaced a former mineral: crocidolite and as a result has taken its fibrous structure given the special chatoyancy. This phenomena is called pseudomorphism.

Cryptocrystalline (from the Greek word "crypto" meaning "hidden") refers to the crystals which are too small to be seen even through a microscope. They usually react as an aggregate through a polariscope. Crystals from this variety are semitransparent to opaque. Although taken in the large meaning chalcedony is a cryptocrystalline synonymous, stricto sensu chalcedony is the biggest subdivision of this category with many stones as chrysoprase (light green), sard (brownish red) and even fossilized wood (i.e. has been entirely replaced by chalcedony preserving the original shape; it is pseudomorph as "tiger eye"). Another subdivision gathers all kinds of agate (e.g. moss agate, dendritic agate, etc?) while the last one concerns the jasper (e.g. heliotrope).