Precious black and light opals from Australia. High quality and best prices, worldwide delivery. Unique gems are available for order in accordance with particular parameters and within the budget of the customer.
Opal is very popular in the jewelry world and has a rich history. The name of the mineral is due to ancient Sanskrit word "upala" which means precious gem. Experts believe that jewelers used opals for several centuries before the Christian era. The main advantage of the mineral is the opalescence effect, which is a consistent ability to reflect the different rays under the influence of the light source. The amazing color play of opals possible due to this effect.
Interestingly, the composition of opals comes a certain amount of water, which in some instances exceeding 10% of the total weight. Opals do not have crystalline structure like most other gems. They are formed from hardened gel-based homogeneous close-Packed spheres of silica. For the same size spheres, the refraction of incident rays of light, called diffraction. Due to the diffraction of opal play beautifully with different colours. If the sizes of the spheres are different, diffraction is absent, which is typical for dairy opals. Significant differences in the optical properties of spheres and the voids contribute to the maximum manifestation of the vivid colors of the game. Such qualities in the first place have black opals, unsurpassed palette of colors.
Opals are divided into noble and common. Precious opals are distinguished by the presence of an optical effect known as opalescence. The effect is manifested as the light, forming a bright spots shimmering on the surface. Considering natural gem at different angles and of incidence of the light rays, you can enjoy the brightest coloured flares, changing its color.
In trade to describe the nature of the pattern of colored spots use special terms – patterns: pinfire – a lot of small multi-colored color spots, harlequin – pattern resembling the motley costume of harlequin (the rarest and most valuable pattern, the value of opals with a pronounced pattern harlequin may exceed 10 000 US dollars per carat), honeycomb – coloured cells, like a honeycomb.
Black opals are among the most high priced based on their rarity and the presence of the stunning color play, iridescent dark gray or black surface. The cost of black opal with green-blue tints up to 7,000 dollars for a 1 carat, opal and red-orange tint - $ 10,000 for a 1 carat.
White opal play of colors occur in the background, having a white or whitish-lactic tone, which reduces the effect of the color. Note that white opals are considered the traditional color because it was detected early black. Extraction of the most expensive black and white opal is on the fields of Australia and Ethiopia. Fire opals are mined in Mexico, have transparent or slightly turbid basis. The attractiveness of fiery opals based on the presence of an intense orange hue. In some instances observed color flash of low intensity. Some examples of Mexican fire opals are distinguished by the presence of orange color and significant opalescence. Water (jelly) transparent opals, and the color modulations give them the appearance of frozen soap bubbles.
Craftsmen perform cut black and white opals in cabochon, contributing to the effective identification of the color of the game. The surface of cabochon opals black is almost flat in view of the fact that a layer of iridescent colors is very subtle. Of gems water or fire coloring make great high dome.
The elevation of opals in the form of impregnation of different polymers used to stabilize the gem. Opals are highly dependent on changes in humidity and temperature, such impregnation helps to keep the gem for years to come. Also impregnation visually hide the porosity of opal and cracks. It is important to note the presence in the jewelry market of doublets, triplets or synthetic opals. Doublet – a composite gems consisting of a thin layer of opal and black chalcedony. The cost of such gems is very low.
Since ancient times, the jewelers of India and East Africa have produced a wealth of items adorned with opals. Mystical multicolor glow gems attracted and fascinated numerous customers. In modern times in the jewellery market are valued above all various models of rings, earrings, pendants and pendants with black opals from Australia. The price of such products can be tens of thousands of dollars. Most available models of rings or earrings with opals, white, light blue or fiery shades. The Windows of the Russian jewelry stores rarely made on the basis of natural opals. Sells mainly jewelry with gems white or bright blue tone, which actually are artificial crystals or imitations. Often in commercially available products with opal doublets and triplets. Virtually non-existent in stores necklaces and bracelets, decorated with natural opals.
In Asian countries popular are various models of men's rings or rings with black opals or other types of these gems. Note the presence of jewelry with opals of different colors in the collections of the famous brand Tiffany & Co jewelry and a few home from Asia, which is made in one piece.