Tiêu đề Fancy colored diamonds.pdf ✅

Table of Contents Subject Page Diamond Color Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Hue, Tone, and Saturation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 How Color Happens in Diamonds . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Diamond Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Fluorescence and Phosphorescence . . . . . . . . . . . . . . . . . . . . . . . . . .8 Influences on Diamond Color . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 Cut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 Treatments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 Fancy-colored Diamonds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 Diamond Colors and Rarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 Pink, Red, Purple, and Orange Diamonds . . . . . . . . . . . . . . . .17 Blue Diamonds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Green Diamonds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 Brown Diamonds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 Yellow Diamonds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 Black Diamonds and White Diamonds . . . . . . . . . . . . . . . . . . .25 The Fancy-colored Diamond Market . . . . . . . . . . . . . . . . . . . . . . .26 Key Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29 Key Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
DIAMONDS AND COLOR It’s sometimes hard to think of the words “diamonds” and “color” at the same time. After all, most people think of diamonds as colorless. But the reality is that many diamonds that look colorless actually have a small amount of color—usually yellow or brown. And diamonds come in a startling array of other colors, too. In fact, they come in just about every color of the rainbow. The rich, blue Hope diamond, perhaps the most famous diamond in history, is on display in the Smithsonian Institution in Washington, D.C. People the world over line up to see it, just as people line up at the Louvre in Paris to view the Mona Lisa. Just as that painting is one of Leonardo da Vinci’s masterpieces, the Hope is one of nature’s master- pieces. Truly colorless diamonds command high prices. But the prices of naturally colored diamonds are also spectacular. The 0.95-ct. Hancock diamond is a good example. When the GIA Laboratory first graded it as 1 ©Fred Ward 2002 Key Concept s Many people think of diamonds as colorless, but most diamonds have small amount of color, usually yello or brown.
What are the basic elements of color? What are the possible causes of diamond color? What are some treatments used to alter or add diamond color? A truly pure diamond would be composed entirely of carbon atoms. As you learned in Assignment 7, each carbon atom has four outer electrons orbiting its nucleus, and each one shares its outer electrons with four adjacent carbon atoms. A diamond with this ideal composition and structure would be totally free of color. In reality, most diamonds in the market range from colorless or nearly colorless to light yellow or brown. This is known as the normal color range. It’s also called the D-to-Z range because of the letter designations given to each step in the color scale. Fancy purplish red in 1956, it sold for $13,500. In 1987, it sold for $880,000—a record-setting $926,000 per carat. Not all colored diamonds sell for such incredible prices. The ones you’re most likely to encounter are probably more modestly priced browns and yellows. Nonetheless, colored diamonds hold an exotic allure for diamond professionals as well as consumers. DIAMOND COLOR BASICS Normal color range—Range of diamond colors from colorless to light yellow and light brown, also called the D-to-Z range. 2 Yellow, blue, and pink are among the most spectacular diamond colors. The 0.95-ct. Fancy purplish red Hancock diamond made gem auction history when it sold for $926,000 per carat in 1987. This brownish yellow 200.86-ct. pear-shaped diamond is exceptional because of its size and its depth of color. Most diamonds on the market have only a small amount of yellow or brown color. DIAMONDS AND DIAMOND GRADING 12 Tino Hammid/GIA Harold and Erica Van Pelt/GIA Richard Drew/AP Wide World Photo