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Akoya Pearl The Grading
1916; Kikichi Mikimoto produced the first large Akoya pearls are cultivated at Ago Bay, Japan. These pearls were unlike any the world knew. They were all of pearls, pearl nucleus has developed a growing method called grafting. Small ball was transferred to the host oyster reproductive organs, together with a small piece of donor mantle tissue - the pearl and pearl sac development of catalyst deposition - the formation of pearls.
Akoya pearls are today still a favorite staple in every woman's jewelry collection of the most popular gem and jewelry sold in fine stores around the world. They are known for their perfectly round shape, sharp and bright shiny white body color with hints of rose and silver color.
Selecting fine lines can be very difficult, however. Not unlike a diamond, the direction will be determined by the quality of its beauty, durability, and ultimately its price. Users should be aware of Gemological Institute of America (GIA), the value of the five factors in 1967 and used to assess the quality of Akoya pearls. They are the size, shape, luster, nacre thickness and surface area.
Size
Akoya pearls are often quite small. Approximate size is 7 mm in diameter, with an average length of 17-18 Princess cm. Most fall within the size range of 3 mm to as large as 10 mm. If the value of all other factors are consistent, Akoya pearls are more valuable.
Form
While the form is an important characteristic value of other types of pearls such as freshwater and Tahitian, Akoya pearls are generally very round. It is therefore perfectly spherical pellets implanted into the oyster. Pearl is deposited around the bead and Akoya pearls, most production is round as a result. Other forms such as symmetrical and baroque drops do occur, but the round pearls as more valuable.
Gloss
Gloss is a measure of quality and quantity of light reflected from the pearl surface. Akoya pearls are known for their luster and sharp reflection of a mirror like surface. Sharper and more vivid reflection of the more valuable pearls. Luster is the most important factor to consider when purchasing value of the Akoya pearl necklace.
Nacre Thickness
Akoya pearl nacre thickness is very important. Today the pearl market is beyond what is known as a trade "short culture of Akoya pearls. These pearls have been harvested too early and not enough to cover over his mother-pearl beads. These pearls are commonly found on eBay and jewelry stores for a very low price. But with the caveat that these gems will not last, nor will they show a sharp metallic luster. Gloss and durability are directly correlated with the pearl's nacre thickness.
Surface
Cultured pearls are only organically produced gems of the world. They do not need to be cut or polished to show its beauty, so each will be unique as a snowflake, exhibiting the growth characteristics of various kinds. These growth characteristics, no matter how small or how large, are known as inclusions and blemishes. Since all the pearls have some form of growth is characterized by the U.S. Federal Trade Commission is not allowed to use the term "perfect" description of the use of cultured pearls.
Despite the fact that the growth characteristics are generally evident pearls, their properties and assess the degree of surface quality Akoya pearl. If all other factors in the classification would be consistent with less inclusions or blemishes visible to the naked eye, the more valuable pearls.
- EPA Classification System
Although widely accepted rating system Akoya cultured pearls are now available, but there is indeed an industry best practice standards, using the classification system - EPA and hanadama.
Hanadama degree of pearl necklace is one that has been approved by the Pearl Science Laboratory of Japan as a high quality display features in accordance with the form, luster, surface, and nacre thickness.
Akoya direction that could be attributed to EPA of all the factors must be owned by five per cent of the quality criteria. AAA-class areas are considered the best at hanadama certified areas in the world.
Field of pearl or not the EPA test is one that fails to five percent of each quality criterion. Class AA, the direction is within the top 20 percent, while Class AA + if the direction is between AA and Class AAA.
Origin
There is a rapid decline of Akoya cultured pearl discussion of origin and its relation to quality and value. It was once believed that only those from Japan were the best quality and most valuable. Today it is well known that the Akoya pearls are also produced in South Korea, China, Vietnam and even Australia. Pearls from Australia and China have found that the thicker the nacre than their Japanese counterparts, and often a better overall quality. Country of origin is not the value of coefficient of Akoya cultured pearls are sorted.
Understand the value of the factors associated with Akoya cultured pearls, the buyer will be educated decision in choosing the best direction. The first step is to find a retailer that understands the complexities of the Akoya pearl grading and compliance with the strictest standards. This is usually the retailer, which specializes in pearls and have a great selection of different sizes and types of easy comparison.
PearlStruck.com are international seller of quality Akoya pearls are graded and evaluated in accordance with the standards laid down by the GIA. Our inventory exceeds more than 1,000 strands of the whole class of AA or better. We believe that the best course to suit every taste, style or budget.
Ann McCarville is a gem expert with many years of gem buying, selling, and grading practices. She is the founder and president of PearlStruck, internet providers, fine pearls.
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Are these fish compatible with megalodoras irwini (mother of pearl catfish)?
Oscars, parrotfish, silver dollar, large gouramis, plecostomus, payara, alligator gar, pictus catfish?
from what I know, silver dollar seems to be fine with them, along with smaller oscars. I have seen a huge Oscar (it scared my dog xD ) and he was all by himself because of his size.
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