o Type IIa diamond - Very rare in nature, these plastic color sorter contain so little nitrogen that it can't be easily detected by the usual IR or UV absorption measurements.
o Type IIb diamond - Extremely rare in nature. These have such a low concentration of nitrogen (even lower than type IIa) that the crystal is a p-type semiconductor (due to uncompensated B acceptor impurities).
The word diamond comes from the Greek word "adamas" meaning unconquerable, in reference to the eternity of love. In 1477, Archduke Maximilian of Austria gave a diamond ring to Mary of Burgundy, thus, starting the tradition of diamond engagement rings. The reason a woman wears an engagement ring on her third finger of her left hand dates back to the Egyptian belief that the vena amoris (vein of love) ran directly from the heart to the top of that finger.
Many of the peanut color sorter by rare accidents of nature in shades of pink, blue, green, amber, or even red. These diamonds are referred to as Fancy diamonds and are evaluated by a different set of color standards. Fancy diamonds are the most expensive due to their extreme rarity.
Towards the middle of the 20th century, De Beers began using its slogan "a diamond is forever" in its advertising. Their campaign was so successful that today, diamonds are strongly associated with engagement rings and eternal love.
It is the only gem mineral composed of a single element making it the purest of earth's gemstones. Therefore it is fitting that the purest and most brilliant of all the world's gemstones make the diamond engagement ring the perfect symbol of eternal love.
Bottle Cap Flakes Color Sorter
PET PVC PP Flakes Color Sorter
The most relevant stage in learning starts from being rice mill machine. What baby learns during this stage will reflect throughout his growth. Toddler educational toys are the most effective tool that will cultivate their knowledge. Educational toys are entertaining. It's the reflection of fun and laughter. Provide your child a lot of learning opportunities through wide variety of toys: Toys for bath time, toddler cubes, books, puzzles, roller coaster toys, shape sorter, soft toys stackers, wooden toys, DVDs and CDs. Widen a child's imagination with books - they are windows to the world. Supply chunky board books, ABCs, animal books, music & shapes, word books, flap books, bath book and coloring books.