Opals Australia Gold

Though opals are found around the world, Australia is the biggest source . Precious opal is a hydrous silicon dioxide material, that flashes iridescent colors when it is seen from different angles, or when the is moved or when the light source is moved. This is also know by the term Koroit-Opal.( Boulder Opals)

Certain opals display quite different colors once viewed from different directions, or when the Koroit-opal is turned, or when the light source is moved around. This phenomenon is known by the term “play of color” or opalescence. The color in many Opals is truly exceptional and very pleasing to then eye. The wide range of color in a particular Opal is determined by the diameter and spacing of the silica spheres. Certain colors of an Opal can change depending upon the angle of light incidence, so when an Opal is rotated, its color can change or disappear completely.

Boulder Opals or Koroit-opals is a term for opal mining this is not a actual city or suburb.

Boulder Opals exhibiting such colors, are termed precious and are very valuable, those without it are termed common and have little or no value what so ever. The desirability of opal is based upon color Intensity, and diversity, and uniformity, pattern and ability to be seen from any angle. Most precious Koroit opals will show or reflect a number of colors. The only other major amorphous gemstone is amber. Good quality opals are transparent, not milky. The huge number of colors in Opals are caused by the regular array of silica spheres ,diffracting white light, and breaking the light into the colors of the light spectrum.

Opal is a soft stone, as well as a delicate stone. It is usually milky and translucent. Opal is a hardened silica gel containing 5-20% water. Boulder Opals have a rating a 5.5 to 6.5 on the hardness scale. Opal is amorphous, meaning, it has no crystal structure. Opals may be somewhat porous, in which case it is dangerous to immerse it in liquids other than water. Opal is made from small silica spheres arranged in a regular pattern. The type of silica in Opals is chemically similar to quartz, but Opal silica contains water within the mineral structure. Precious Opal generally contains about 6-10% water.

Boulder opals are found in several places in Australia (including finds like Big Ben). Queensland has the highest area of Koroit or boulder opal fields. 70 per cent of the worlds quality opals come from this little Australian settlement. Opals were discovered 1915.

Opals have been considered a mystical precious stone for hundreds of years. It is said to help the wearer’s psychic powers. Opals are supposed to further enhance the positive characteristics for those people born under the zodiac sign of Cancer. Koroit-opals is very chemically similar to quartz, Rubies are said to change color according to the health of the wearer,Opals are also softer type of gemstone, compared to that of diamonds. This may have contributed to the perception of opals being “bad luck”.

About the Author

For the best deal on quality Opals sourced in Australia we can supply you with
Boulder Opal
or a
Koroit Opal
displayed in quality set hand made jewelry.

Part 1 – Mining Boulder Opal in Koroit Australia

COLOR-FILLED VEINS * 44ct SOLID KOROIT BOULDER OPAL, VIDEO $430.00

Koroit Boulder Opal Freeform cabochon great 4 wire wrap $120.00

7 ct Koroit Swirls BOULDER OPAL PENDANT 18K y gold plt $17.99

4 ct Koroit Fancy BOULDER OPAL PENDANT 18K y gold plt $29.99

SUPER-SIZED DAZZLER * 105ct SOLID KOROIT BOULDER OPAL * VIDEO $950.00

GREEN FIRE SOLID CUT KOROIT AUSTRALIAN WOOD FOSSIL BOULDER OPAL 9.15ct $41.08

9 ct Beauty Koroit BOULDER OPAL PENDANT 14K Y Gold Plt $79.99

23 ct Koroit Picture BOULDER OPAL PENDANT 18K gold plt $49.99

13 ct Koroit Beauty BOULDER OPAL PENDANT 18K y gold plt $34.99

9 ct Koroit Gold Striped BOULDER OPAL PEND 18K y g plt $69.99

8 ct Koroit Lovely BOULDER OPAL PENDANT 18K y gold plt $59.99

AUSTRALIAN KOROIT BOULDER OPAL PENDANT sterling silver $49.99

15 ct A+ Koroit NUT BOULDER OPAL PENDANT 14K Y Gld Plt $119.99

Nice Koroit Matrix Boulder Opal, Freeform Cabochon, 12.40 Carats $7.99

Patterned Koroit Boulder Opal, Freeform Cabochon, 18.40 Carats, Double Sided $24.99

Nice Koroit Boulder Opal, Freeform Cabochon, 20.00 Carats, Double Sided $14.99

Koroit Boulder Opal Rough Slice “AAA” * AWESOME PATTERNS! Australia $37.99

Nice Koroit Boulder Opal, Freeform Cabochon, 25.45 Carats ,Double Sided $24.99

AMAZING DOUBLE-SIDED 8ct SOLID KOROIT NUT BOULDER OPAL * C VIDEOS $113.02

FLICKERING RED SOLID KOROIT BOULDER OPAL PENDANT SILVER $315.00

MAGNIFICENT PATTERN & COLORS SOLID KOROIT BOULDER OPAL $620.00

FLICKERING COLORSHOW 48ct SOLID KOROIT BOULDER OPAL $225.00

26.5 CARAT KOROIT BOULDER FIRE OPAL SLAB AUSTRALIA SOLID OPAL ROUGH RUB LOT#18 $0.99

83.5 CARAT KOROIT BOULDER FIRE OPAL SLAB AUSTRALIA SOLID OPAL ROUGH RUB LOT#19 $0.99

VIBRANT RED & GREEN * 22ct SOLID KOROIT BOULDER OPAL * VIDEO $265.00

4.85 carat Gorgeous Sparking Pinfire Colour Pattern Solid Koroit Boulder Opal $39.58

GEM MULT-COLOUR FIRE SOLID CUT KOROIT AUSTRALIAN BOULDER NUT MATRIX OPAL 16.5ct $11.38

Australian Koroit Boulder Opal – 9.75ct – 18.8×13.2×4.6mm Includes Video #4 $1.56

Australian Koroit Boulder Opal – 9.10ct – 17.8×13.2×4.8mm Includes Video #8 $1.56

Australian Koroit Boulder Opal – 5.23ct – 14×9.4×4.5mm Includes Video #9 $1.56

Opal, Koroit boulder opal 20 mm x 20 mm 28.95 ctw greens blues, natural $0.02

Austrailian Koroit Boulder Matrix Opal Rough #R7 $9.99

Austrailian Koroit Boulder Matrix Opal Rough #R8 $9.99

Austrailian Koroit Boulder Matrix Opal Rough #R9 $9.99

37.40ct polished Koroit boulder opal- Video $9.99

Koroit Boulder Opal 1lb 8 oz Chunk Old Collection Nice ONe! $100.00

MAGNIFICENT PATTERN & COLORS SOLID KOROIT BOULDER OPAL $560.00

GEM COLOR-FILLED VEINS 22ct SOLID KOROIT BOULDER OPAL $310.00

28.54 CARAT KOROIT BOULDER FIRE OPAL SLAB AUSTRALIA SOLID OPAL ROUGH RUB LOT#20 $0.99

9.4ctw Impressively Well Cut Sparking Pinfire Pattern Solid Koroit Boulder Opal. $158.37

5-PIECE SET * 67ct SOLID KOROIT NUT BOULDER OPALS * SEE VIDEOS $1,555.00

Koroit Boulder Opal-55.5cts $37.00

Koroit Boulder Opal-40.5cts $81.00

7.5ct. KOROIT BOULDER OPAL-PINFIRE BLUE/GREEN COLORS ON BROWN IRONSTONE $7.50

AUSTRALIA – KOROIT BOULDER FIRE OPAL SPECIMEN – PIN FIRE THROUGH OUT $7.00

735 grams Austrailian Koroit Boulder Matrix Opal Rough $9.99

Good Quality Sparking Bright Colour Pattern Solid Koroit Boulder Opal 6.01 ctw $59.38

GEM GREEN FIRE SOLID CUT KOROIT AUSTRALIAN BOULDER NUT MATRIX OPAL 11.5ct $42.56

Australian Koroit Boulder Opal – 2.68ct – 10.2×8.7×3.7mm Includes Video #10 $1.56

Australian Koroit Boulder Opal – 8.32ct – 17.3x11x4.2mm Includes Video #11 $1.56

Australian Koroit Boulder Opal – 6.70ct – 13.9×13.7×4.7mm Includes Video #12 $1.56

VIBRANT COLORS 19ct SOLID KOROIT BOULDER OPAL * C VIDEO $265.00

QUEENSLAND 14ct SOLID KOROIT BOULDER OPAL * C VIDEO $23.99

RICH REDS * 28ct SOLID KOROIT BOULDER OPAL * C VIDEO $1.00

KOROIT BOULDER OPAL CHIPS INLAY MOSAIC 925 STERLING SILVER PENDANT OCA1218 $39.00

MAGNIFICENT MULTI-COLORED SOLID KOROIT BOULDER OPAL $615.00

GLACTIC COLORSHOW 225ct SOLID KOROIT BOULDER OPAL $820.00

GEM GREEN FIRE SOLID CUT KOROIT AUSTRALIAN BOULDER NUT MATRIX OPAL 10ct $24.75

MULTI-COLOUR FIRE SOLID CUT KOROIT AUSTRALIAN BOULDER NUT MATRIX OPAL 14.3ct $20.30

173.0 ct. Nice Solid Gemmy Chunk of AAA Koroit Boulder Opal Stone, No Waste! NR $12.27

Koroit Boulder Opal-44cts $65.00

KOROIT BOULDER OPAL EARRINGS 925 STERLING SILVER OCA1268 $47.00

KOROIT BOULDER OPAL EARRINGS 925 STERLING SILVER OCA1269 $93.00

MAGNIFICENT COLORS 36ct SOLID KOROIT BOULDER OPAL, VIDEO $685.00

MAGNIFICENT PATTERN & COLORS 35ct SOLID KOROIT BOULDER OPAL, VIDEO $935.00

Koroit Boulder Opal Necklace*Whole Nut $29.00

Koroit Boulder Opal Pendant ***Necklace***Nice*** $34.00

KOROIT BOULDER OPAL CHIPS INLAY MOSAIC PENDANT 925 SILVER 66.4ct OCA1251 $32.90

KOROIT BOULDER OPAL PENDANT 925 STERLING SILVER 38.6c OCA1252 $29.00

KOROIT BOULDER OPAL PENDANT 925 STERLING SILVER 56.9c OCA1266 $42.00

KOROIT BOULDER OPAL 925 STERLING SILVER TWISTED WIRE PENDANT OCA1125 $42.00

RARE CATHEDRAL WINDOW PATTERN SOLID KOROIT BOULDER OPAL $1,985.00

MAGNIFICENT PATTERN & COLORS SOLID KOROIT BOULDER OPAL $1,025.00

LIVELY DOUBLE-SIDED 12ct SOLID KOROIT BOULDER OPAL $525.00

BLAZING REDS 46ct SOLID KOROIT BOULDER OPAL * SEE VIDEO $495.00

Koroit Boulder Opal cabochon, 16cts, $59.00

MAJESTIC REDS 44ct SOLID KOROIT BOULDER OPAL * C VIDEO $1,320.00

*10.34ct FINE! Koroit BOULDER Matrix OPAL!! $59.50

*7.51ct FINE! Koroit BOULDER Matrix OPAL!! $119.50

*7.93ct FINE! Koroit BOULDER Matrix OPAL!! $179.50

GEM GREEN FIRE SOLID CUT KOROIT AUSTRALIAN BOULDER NUT MATRIX OPAL 8.3ct $0.98

29.38CT AUSTRALIAN KOROIT NUT BOULDER OPAL PENDANT $390.00

AUSTRALIAN KOROIT BOULDER OPAL 77.3ct BRILLIANT MULTI-COLOR FIRE 36x31mm $199.99

Koroit Boulder Opal Freeform Cabochon Multicolor Fire $220.00

OPAL WIREWRAP PENDANT S.S. BOULDER OPAL (KOROIT) $95.00

Koroit Boulder Opal cabochon-44.5cts $45.00

Koroit Boulder Opal Necklace Pendant Wire Wrap Sterling $415.00

Koroit Boulder Opal Necklace Pendant Wire Wrap Sterling $415.00

Koroit Boulder Opal Necklace Pendant Wire Wrap Sterling $160.00

KOROIT BOULDER OPAL PENDANT 925 SILVER LEATHER CORD 17.9ctw OCA1048 $14.90

KOROIT BOULDER OPAL PENDANT 925 SILVER 53.8c OCA716 $49.00

KOROIT BOULDER OPAL PENDANT 925 SILVER 41.7c OCA714 $49.00

KOROIT BOULDER OPAL PENDANT 925 SILVER 71.3c OCA609 $39.00

Koroit Boulder Opal Cab * Bright Fire * $199.00

Koroit Boulder Opal Designer Cabochon HS WoW! $25.00

HS Koroit Boulder Opal Cabochon WoW! $46.50

HS Koroit Boulder Opal Cabochon WoW! $38.50

KOROIT BOULDER OPAL 925 STERLING SILVER EARRINGS OCA1289 $52.00

KOROIT BOULDER OPAL 9k YELLOW GOLD EARRINGS OCA1287 $278.00

KOROIT BOULDER MATRIX OPAL ROUGH SLICES* $99.00