👁 Image
| | Journal (issue) | | April2000
2000
April
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Okkampitiya gem
gem field,
field,
Sri
Sri Lanka
Lanka
1
1
2
V.
V.Mathavan...University
University ofofPeradeniya,
Peradeniya,Sri
SriLanka
Lanka
2.2.Institutfur
Institut für Geowissenschaften...discovered
recently
recently in
inthe
theOkkampitiya
Okkampitiya gem
gem field
field which
which isissituated...situated in
in south-eastern
south-eastern
Sri
Sri Lanka.
Lanka. These
These are
are (1)
(1) the
the gem-bearing | 👁 Image
| | Journal (issue) | | (Brazil and
Colombia), central and southern Asia (Sri
Lanka, India, Afghanistan, Pakistan, Russia,
and China)...come from a
number of sources, but predominantly Sri Lanka.
Accented with smaller diamonds, the 129 gem corundums...Boehm, March 1993.
the alluvial gem fields of Sri Lanka and the pegmatite districts of Brazil. Efforts...Asia (Thailand, Cambodia, Myanmar, Vietnam,
and Sri Lanka; again, see figure 1). Although mining continued...high-quality
blue and pink sapphire came from Sri Lanka and,
more recently, Madagascar (Suwa, 1999). In | 👁 Image
| | Journal (article/letter/editorial) | | textures in grossular–wollastonite–scapolite
calc–silicate granulites from Maligawila, Sri Lanka: evidence...Geology, University of Peradeniya, Peradeniya, Sri Lanka
Institut für Geowissenschaften, Johannes Gutenberg-Universität...18 July 2000; accepted 1 August 2001
Abstract
Grossular – wollastonite – scapolite calc – silicate granulites...overthrusted rocks of the Highland Complex of Sri Lanka, preserve a number of spectacular coronas and...Complex of Sri Lanka
Abbreviations: Alm, almandine; An, anorthite; Cc, calcite; Gros, grossular; Me, meionite; | 👁 Image
| | Journal (issue) | | iridescent chatoyancy Grey orthoclase moonstone
from Sri Lanka has a unique combination of a cat's-eye and a...Brazil and
another colourless of 12.20 ct from Sri Lanka,
but this specimen is considerably larger.
Two...Moonstone with a star and cat'seye combination from Sri Lanka
Sunstone cat's-eye from Russia
A stone described...purchased in Germany and probably comes
from Sri Lanka, where a similar one was
offered to the author...located
31.5 km south of the city of Wroclaw in the
province of Dolny Slask (Lower Silesia),
southwest Poland | 👁 Image
| | Journal (issue) | | from Guyana
Surface Features of Ekanite from Sri Lanka
A Study of Gems from Napoleon III’s Crown
A New...EDITORIAL
137
Diamonds from Guyana, Ekanite from Sri Lanka, a New Amber Source in
Vietnam, and More...
Duncan...characteristics of ekanite from secondary deposits in Sri Lanka.
168
A Gemological and Spectroscopic Study with...0016-626X
Diamonds from Guyana, Ekanite
from Sri Lanka, a New Amber Source in
Vietnam, and More...
Welcome...uneven shapes and surface features of ekanite from Sri Lanka. Lutz Nasdala and his team
analyze ekanite fragments | 👁 Image
| | Conference Proceedings | | Henry A. Hänni, Switzerland; Mr. Gamini Zoysa, Sri Lanka; Dr. Karl Schmetzer, Germany; Prof. Dr. Emmanuel...(1979), Kashiko-Jima, Japan (1981), Beruwela, Sri Lanka (1983); Sydney, Australia (1985); Rio de Janeiro...Norway, Russia, Singapore, South Africa, Spain, Sri Lanka, Switzerland, Sweden, Tanzania,
Thailand, U.S...Chen Yanyu, Arūnas Kleišmantas: Spinels
from Sri-Lanka.
11
36 th IGC 2019 – Nantes, France
Co nference...Chanmuang N. ,
E. Gamini Zoysa : Ekanite from Sri-Lanka : what can we learn from a radioactive gemstone | 👁 Image
| | Journal (issue) | | instrumentation such as LA-ICPMS—once primarily the province of academia—became a fixture in many gemological...were combined under the
jurisdiction of the U.S. District Court of New Jersey
168
PRODUCTION AND MARKETS...addition to the traditional spinel sources of Sri
Lanka, Pakistan, and Myanmar (spinel, if polished
elsewhere...start operations at
the Kagem mine in the Kafubu District, historically
Zambia’s largest source of emeralds...ultimately decided in eBay’s
favor when the U.S. District Court of New York
determined that the burden of | 👁 Image
| | Journal (issue) | | fluorite from
Pakistan and Vietnam|Bicoloured grossular from
Kenya|Jade-like materials sold
in Myanmar|Blue...supplier, the fluorite was mined from Cao Bang
Province, northeast of Yen Bai. The crystal surfaces
were...29.05 ct fluorite is reportedly from Cao Bang
Province in northern Vietnam. Photo by Bilal Mahmood.
...magnified 50×.
Bicoloured Grossular from Kambanga, Kenya
Light yellow-green grossular from Kambanga,
Taita-Taveta...Taita-Taveta District, Voi, Kenya, is notable for
having a significantly lighter colour than the
tsavorite | 👁 Image
| | Journal (issue) | | occur in the John
Saul ruby mine, Taita-Taveta District, Kenya
(Simonet, 2000) which is located just north...change to green by heating
of red corundum from Sri Lanka, and
reversion to red by cooling. Thermochromy...of four green tourmalines from
the Taita-Taveta District, Kenya. For the
present study, the contents of...2000. Geology of the Yellow Mine (TaitaTaveta District, Kenya) and other yellow tourmaline
deposits in...the Isalo area of Madagascar, from Ratnapura, Sri Lanka and from Mogok,
Myanmar, a nearly complete overlap | 👁 Image
| | Journal (issue) | | in
Colorless, Yellow, and Blue Sapphires
from Sri Lanka
Kcirl Scl~metzerand Olaf Medenbach
REGULAR
FEATURES...Banjarmasin-Martapura area of southeastern Kalimantan
(the province of Kalimantan Selatan). The gemological
characteristics...map shows the two major areas
(left
the Landak district of western Kali=
man tan, below = the Bmjarn~asin-Maitapura...000 guilders worth of diamonds from
the Landak district in what is now western
Kalimantan.
The 367-ct...Banjarmasin,
the capital city of Kalimantan Selatan province. In
GEMS & GEMOLOGY
Summer 1988
this area | 👁 Image
| | Journal (issue) | | NEWTECHNIQUES
Sapphires from Changle in Shandong Province, China
fingfeng Guo, Fuquan Wang,
and Gerry Yukoumelos...predon~inantlyindustrial production
in nearby Zaire (East Kasai province), that in Angola
is reportedly 70% gem quality...Shield near
Arkhangelsk (on the White Sea, in the province of
Oblast, near the border with Finland) gives...subsequently-for example, in clusters in the State Line district
of Colorado and Wyoming, in the Lake Ellen group...portions of which
contain the largest geologic province of lamproitic
roclzs in the world (Peterson, 1992) | 👁 Image
| | Journal (issue) | | Number 2 TABLE OF CONTENTS FEATURE ARTICLES 62 Sri Lanka: The Gem Island Peter C. Zwnan The Identification...a n y fine gemstones found on the island o f Sri Lanka, the subject of Peter Zwaan's article i n this...this issue. This fine 9.57-ct cabochon from Sri Lanka is pictured here against a 19th century lithograph...not of the publishers. SRI LANKA: THE GEM ISLAND By Peter C. Zwaan Sri Lanka, formerly Ceylon, remains...mined by primitive methods. In many instances, the Sri Lankan origin of the gemstone can be determined by | 👁 Image
| | Journal (issue) | | Scapolite
with Unusual Properties from Embilipitiya, Sri Lanka
Pieter C. Zwaan
Some Tanzanite Imitations
Lore...well-representedin this issue: Unusual gem materials from Sri Lanlza (a country Bob visited several years ago)...world gem market as the
Ouro Preto Imperial topaz district comprises two major active
mining sites-Cap50...operation is the Cap50 mine, in the Rodrigo Silva
district. Specimens and information about that mine were...occurrence) on the west, both in the Ouro Preto district
(again, see figure 2). Pires et al. (1983)identified | 👁 Image
| | Thesis/Dissertation | | end-members pyrope, almandine,
spessartine, andradite, grossular, and uvarovite. The large variation in garnets...divided into two species: ugrandite (uvarovite, grossular and andradite) and pyralspite
(pyrope, spessartine...as pyrope-andradite, spessartine-grossular, and almandine-grossular. This
study concluded that refractive......................... 21
2.5.3.1.2.3. Kerman Province, Iran and Kaghan Valley, Pakistan ........................ 22
2.5.3.1.2.4. Erongo Province, Namibia ................................................ | 👁 Image
| | Journal (issue) | | applied to turquoise sourced from China’s Hubei Province.
Next, Che Shen and coauthors provide a mathematical...source of commercial turquoise in China’s Hubei Province, where mass
production has been ongoing for several...many residents of Shiyan City
in China’s Hubei Province owned turquoise, though
few were conscious of...decorative materials in the 1980s
in Yun County, Hubei Province. Photos by Ling Liu.
RESIN-FILLED TURQUOISE
...and so far it has not been widely
used in Hubei Province. Although Chinese manufacturers were initially | 👁 Image
| | Book | | star ru 1n h world. co,nes from ll.at'na ra ·n n Sri Lanka. FAMOUS ROSSER PHOTO COURTESY REEVES OF...cabochon and comes from the Ratnapura Mines • Lanka. ...............................................example of the gems of the Chanthabury mining district in Eastern Thailand. 8 SSS IS S ••••SS•.•••... Nalin Fernando and Milfer Caffoor, Colombo, Sri Lanka, for trust and perspective. Michael Kazanjian...Khun Kaenn. Khun \Jd. ·ck and Goh in Khan Kaen Province. Bangkok and Chonburi. as ell as Khun Suchada | 👁 Image
| | Journal (issue) | | North-West Branch: S. Hill, F.G.A.
South Yurkshire & District Branch: J. L Reynolds, F.G.A.
Examiners:
E. A...with lavas and there is only one major volcanic
province - that of Thailand and Kampuchea
(Cambodia) -...Fire opal
Quartz, smoky
Cornelian
Topaz
Kenya
Sri Lanka
Mexico
Switzerland
India
Brazil
6.03
8.65
1.98...Beryl
Peridot
Brazil
Linde, USA
Sri Lanka
Sri Lanka
Mexico
Sri Lanka
Madagascar
Zabargad
1.76
8.65
5...
.inde, USA
Unknown
Unknown
Cambodia
Unknown
Sri Lanka
Tanzania
Unknown
1.35
10.00
3.77
0.67
8.92
1 | 👁 Image
| | Book (edition) | | extensive fields in the prophetically named Kimberley district of Western
Australia promise to be of world importance...cause raised eyebrows, and even more so with ‘Sri Lanka rubies
and sapphires’ in place of ‘Ceylon rubies...intermediate and acid members of the volcanic province in southern Brazil and
Uruguay, and the fire opals...is in such old river courses in countries like Sri
Lanka and Thailand that the water-worn pebbles of many...intrusion may contain calcic minerals such as grossular garnet and
diopside. The cooler zone further away | 👁 Image
| | Journal (issue) | | almandines, 22 pyrope-almandines, five pyropes and one grossular), 20 emeralds, 13 amethysts, four
chalcedonies...following: a clear,
pinkish red gem spinel (Ratnapura, Sri Lanka), three
almandines (from Garibpet and Rajmahal...Anuradhapura, Sri Lanka; no. 23 in Schüssler et
al. 2001), a grossular (Kamburupitiya, Sri Lanka) and
two...graphite samples (crystalline from Kahatagaha, Sri
Lanka, and disordered from Saskatchewan, Canada). As...Garnet: intermediate
pyrope-almandine (22)
Garnet: grossular (1)
Quartz: chalcedony (4)
Spinel (3)
Glass | 👁 Image
| | Book | | pyrochlore) and zircon crystals are common in Sri Lanka gemstones.
The more important syngenetic mineral...mica in andalusite, chrysoberyl, kornerupine and Sri Lanka
sapphire
• calcite in Burmese ruby and spinel;...andalusite
• sphene in ruby and spinel
• uraninite in Sri Lanka sapphire
• zircon in corundum.
Apatite is a characteristic...well seen in some green
and brown zircon from Sri Lanka. The process is called ‘metamictization
and the...complex patterns, especially
in sapphires from Sri Lanka.
Burmese ruby contains short rutile needles, calcite | 👁 Image
| | Book | | pyrochlore) and zircon crystals are common in Sri Lanka gemstones.
The more important syngenetic mineral...mica in andalusite, chrysoberyl, kornerupine and Sri Lanka
sapphire
• calcite in Burmese ruby and spinel;...andalusite
• sphene in ruby and spinel
• uraninite in Sri Lanka sapphire
• zircon in corundum.
Apatite is a characteristic...well seen in some green
and brown zircon from Sri Lanka. The process is called 'metamictization'
and the...complex patterns, especially
in sapphires from Sri Lanka.
Burmese ruby contains short rutile needles, calcite | 👁 Image
| | Report (issue) | | Land der großen Rubine? D. Schwarz,_. Seite 14 Sri Lanka, der erste Klassiker D. Schwarz,_. Seite 16 Die...Zwillinge Makroskopisch nach dem Rhomboeder (oft in Sri Lanka); häufig „polysynthetisch" durch Einschaltungen...aprikosen-farbige Fluoreszenz (z.B. in vielen Sri Lanka-Saphiren) wird hervorgerufen durch die Überlagerung...beinhalten. Man fand solche Steine ursprünglich nur in Sri Lanka; heute kennt man sie auch von anderen Vorkommen...sehr selten und werden vor allem von Myanmar, Sri Lanka und aus dem Umba-Tal erwähnt. Interessant ist | 👁 Image
| | Journal (issue) | | JOURNAL OF THE GEMOLOGICAL INSTITUTE OF AMERICA
Sri Lanka: Where Tradition and Technology Meet
Characteristics...Tomorrow
173
Duncan Pay
FEATURE ARTICLES
174
Sri Lanka: Expedition to the Island of Jewels
Andrew Lucas...Pedro Padua
pg. 175
Offers a firsthand look at Sri Lanka’s mining, cutting, jewelry manufacturing, and...colored stones.
228
Nephrite Jade from Guangxi Province, China
Zuowei Yin, Cui Jiang, M. Santosh, Quanli...article in this issue examines the revitalization of Sri Lanka’s gem and jewelry industry, achieved by combining | 👁 Image
| | Journal (issue) | | diamonds with an “amber
center” • Color-change grossular-andradite from Mali • Glass imitation of
tsavorite...yellow to
brown and bluish white sapphire from Sri Lanka,
known as geuda, could be transformed to a fine...concentration of iron. The 1.40 ct heat-treated Sri Lankan
sapphire on the right is colored by Mg2+-trapped-hole...like Mg2+. The heat-treated yellow
sapphires of Sri Lanka and the natural-color or heattreated yellow portions...colorless sapphire that results from
heat treating some Sri Lankan geuda. In such
stones, we have the condition | 👁 Image
| | Journal (issue) | | trapiche emerald earrings • Large greenish yellow grossular from
Africa • Opal triplet resembling an eye •...field trip to the world-famous Pala pegmatite
district in San Diego County will take place
August 25...1975 Writes
groundbreaking articles
on green
grossular garnet (tsavorite)
deposit in
Kenya
1969
Publishes...sapphires from
metamorphic rocks (e.g., from Sri Lanka) is completely different from that in sapphires...almandine with fibrous sillimanite
from Okkampitiya, Sri Lanka; andalusite with sillimanite fibers from |
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