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The chief peridotite deposits lie on a slope toward the bottom of the largest hill about 1000 meters south of our camp. Rock tailings cover the entire area and most tunnels have been obliterated by dumps. Because these cover even older dumps, it is possible that all of the oldest workings lie beneath newer waste rock. Previous miners had used large screens to sift out crystals from the ore, and a careful search failed to reveal a single large crystal. Overlooked, however, were tiny peridot crystals up to 0.5 centimeters in length which were scattered about a few of the tailings. We collected a score or so of these little crystals–exact microminiatures of the larger crystals seen in museums.
From our observations it seems evident that because of the great size of the deposit some peridot crystals must have been overlooked and remain in deep fissures underneath the dumps. But a large-scale mining operation on Zabargad would require enormous effort. Potable water would have to be converted from seawater; pumps, wash tables, water lines, and tractors could be landed on the island only at great expense. The problems of establishing a base camp, of recruiting a viable and trustworthy crew, of obtaining official mining rights effectively prohibit a successful mining venture.
Color. Peridot is ideochromatic, being colored by the ferrous iron that is basic to its composition. The ideal color is a rich grass-green, but some peridot is yellowish green, greenish yellow or brown. The best colors of peridot generally contain about 10–15% of iron.
Lighting. Peridot is not as light dependent as red and blue gems. It tends to look good under all lights.
Color. Peridot is ideochromatic, being colored by the ferrous iron that is basic to its composition. The ideal color is a rich grass-green, but some peridot is yellowish green, greenish yellow or brown. The best colors of peridot generally contain about 10–15% of iron.
Lighting. Peridot is not as light dependent as red and blue gems. It tends to look good under all lights.
Prices. Peridot ranges in price from about $50–80/ct. for well-cut gems in the 1–2 ct. size, up to as much as $400–450 ct. for large fine gems of top color.
Stone Sizes. Peridot is common in sizes ranging from melee to faceted stones of 10 cts. or more. Fine faceted stones of greater than 300 carats are known, but quite rare.
Sources. Gem peridot has been found in a handful of places around the world. In large sizes (10 cts. plus), Pyaung Gaung in Burma’s Mogok Stone Tract is most important. Faceted gems of hundreds of carats are known from this deposit. In the 1990s, a new deposit from Pakistan’s Suppatt region was discovered, and this material is every bit the equal of that from Burma.
In the US, the San Carlos Apache Indian Reservation supplies good material, but this rarely cuts gems above 10 cts. Peridot is also mined in China, Brazil, Australia and Norway, among other places. The historic deposit of Zabargad has not produced at all in decades.
Enhancements. Peridot is not typically enhanced.