1. Pearl on the basis of origin
a. Natural pearl / natural
Natural pearls occur when there are foreign objects that enter the body molluscs / shellfish, over time the foreign body was wrapped by Contained substances in oysters, increasingly hard and shiny.
The size of the pearl depends on foreign objects that enter into the shells.
Natural pearls are very expensive, usually calculated based on carat weight.
b. Pearl cultivation
such as natural pearls events, occurs in the body shell, but there is human intervention, foreign object deliberately put into the body shells so that the process of pearl formation. This type of pearl sold by size in millimeters.
c. Sea water pearls
Pearls produced by the shells of sea water. Pearls of this type can occur naturally or could be due to natural and cultivated.
d. Freshwater pearls
freshwater pearls produced by oysters that live in freshwater, can in a river or lake.
2. Pearls by shape
a. Round.
In general, this form is highly desirable. Prices are round pearls are the most expensive.
b. Symmetrical
including pear shape and another shape that has symmetry from one side to the other side but not the round.
c. Irregular
pearl of irregular shape is the category of pearls that cost the least expensive, but if the unique shape was very beautiful and interesting.
Mining company Petra Diamonds to find a special stone white diamond in the Cullinan mine, northeast of Pretoria, South Africa, in late September 2009. Findings, disclosed recently.This 507.55-carat diamond worth, weighing approximately 100 grams. Shaped like a spear and large eyes like a chicken egg.The new diamond discoveredParties Petra reveals, this diamond is one of 20 best-quality diamonds and the largest ever found in this world. Color and clarity is very high level, an extraordinary thing for diamonds that have not been processed! The price is estimated at 20 million U.S. dollars or equivalent to Rp190 billion.Mentioned, diamond experts are still analyzing it to determine the most appropriate value.Just to know, Cullinan diamond mines known to always produce high-quality diamonds. One is the world's largest diamond: Cullinan diamond, found in January 1905. Carat value is 3106.75 and weighed 621.35 grams.Once honed, Cullinan diamond cut into nine sections. You can see it in the crown of the kings and queens of England. Diamonds are forever!
Most expensive diamond sales record is broken by a successful Petra Diamonds sells 507-carat diamond valued at Rp 332.5 billion (U.S. $ 35.3 million with an exchange rate of Rp 9500 per dollar), on Friday 26 February 2010. Analysts jewelry, as quoted from Reuters, estimating the value of these rocks is among 20 high-quality diamonds, the average value of Rp 237.5 billion (U.S. $ 25 million). Diamonds are bought through a tender that was won by Chow Tai Fook Jewelry Co. Ltd based in Hong Kong. With record-breaking price of the most expensive, diamond has the potential to become one of the world's most important gem. These sales will boost profits Petra for the fiscal year ended in June with production and higher sales. Petra find the gem rocks in September last year. Petra has a 74 percent stake in Cullinan mine in South Africa, when bought from De Beers in 2007. Cullinan mine is the source of several famous diamonds, including the world's largest rough diamond with a carat 3106. The gem rocks cut from the rock Star of Africa which is currently stored in Britain's Crown Jewels. Petra is a member of the consortium to pay Rp 1.406 trillion (U.S. $ 148 million) when it bought from De Beers Cullinan mine, where 45 percent owned by one of the Anglo-American mining group.
Diamond wedding ring became one of the favorites of young couples to express their true love. Many young couples who dream of the most beautiful moments in life that their ring fingers can be equipped with a diamond ring. A prayer for the permanence of marriage. Unfortunately, time also eroded the glittering ring. Perhaps it is because you are paying less attention to maintenance.
Here is how that can be achieved to maximize your ring to stay beautiful and keep shining:
1. Be careful in wearing the ring. Diamond is a hard material but they are easily cracked so it needs to be careful in using it. Take off the rings on when you perform activities that could affect the quality of the ring such as changing the oil in the car, climbing trees, and others.
2. At the time of exercise is better you let go of the ring, especially sports that involve a lot of hands like volleyball, basketball. Hold the tennis racket is also unfavorable for diamond rings that are decorated around it.
3. By the time you release a better swim ring. Existing chlorine in pool water can change the color of diamonds. Also if you swim in cold water, will cause you to shrink because of the cold finger and the possibility of ring you can release.
4. When cleaning your house better ring removed. Soap and other cleaning will be able to tarnish the ring. It would be better if you remove the ring while washing clothes because the detergent will diminish the glow of your diamond.
5. When gardening is better to release the ring. Chances are you could damage the diamond when gardening.
6. Cooking is a joy most women. You need to remember seasoning dishes used will be able to form a hard coating on the ring is removed.
7. Lotion, sunscreen, hairspray, perfume used can also diminish or change the color of your diamond your diamond. Take off the ring if you would spread the material. And do not use the ring when I'm manicure.
When you see a stain on the ring, wash immediately with soap and water to soak for several minutes until last night. Can also wash the rings in a mixture of water and ammonia are similar in composition to many. But be careful when using the mixture. Do not wash a colored stone and porous in the solution. You can also bring a ring to the jewelers to be washed and checked the form, at least once a year.
