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category archive listing Category Archives: Famous Gemstones

List of famous faceted topaz greater than 1000 carats in weight

May 15, 2008 – 1:49 am

Famous faceted topaz gemstones greater than 1,000 carats in weight, arranged in descending order of weights

S/N

Name
Source
Carat Weight
Cut/Shape
Color
Present Owners

1
El-Dorado Topaz
Brazil
31,000
emerald
yellowish-brown
Programa Royal Collections

2
Lua de Maraba
Brazil
25,250
octagonal
gray
Programa Royal Collections

3
American Golden Topaz
Brazil
22,892.5
cushion
yellowish-brown
NMNH - Smithsonian

4
Brazilian Princess Topaz
Brazil
21,005
square-emerald
light blue
AMNH - New York

5
Golden Topaz Sphere
Brazil
12,555
spherical
yellowish-brown
NMNH -Smithsonian

6
Topaz Amarelo
Brazil
9,600
pear
yellow
Programa Royal Collections

7
Topaz Azuli
Brazil
8,225
cushion
vivid blue
Programa Royal Collections

8
Unnamed
Brazil
7,725
unknown
yellow
NMNH - Smithsonian

9
Unnamed
Brazil
4,202
emerald
colorless
Programa Royal Collections

10
Unnamed
Brazil
3,273
unknown
blue
NMNH - Smithsonian

11
Unnamed
Brazil
2,915
oval
colorless
Programa Royal Collections

12
Unnamed
Brazil
1,833
pear
blue
Programa Royal Collections

13
Unnamed
Brazil
1,800
oval
blue
Programa Royal… Continue reading

By Dr Shihaan | Comments (1)

Famous Topaz Gemstones- Cut and Uncut

May 14, 2008 – 3:15 pm

Chemistry of the mineral Topaz

Topaz is a silicate mineral which is the largest and most important class of rock-forming minerals. Topaz belongs to the sub-class Nesosilicates, the simplest of all silicates in which the tetrahedral SiO4 units exist separately, but are held together by metal cations as in… Continue reading

By Dr Shihaan | Comments (0)

American Golden Topaz

May 12, 2008 – 8:13 am

Origin of name

American Golden Topaz

© Smithsonian Institution

The “American Golden Topaz” which is of Brazilian origin, and resides in the Natural History Museum of the Smithsonian Institution, at Washington DC, is the largest faceted golden topaz and perhaps the largest faceted gemstone of… Continue reading

By Dr Shihaan | Comments (1)

World’s Largest Star Rose Quartz - Michael Scott Collection

May 9, 2008 – 4:34 am

Origin of name

The Michael Scott Collection, arguably the most important private gem collection in the United States, with a few rivals in the world outside of the royal families, was started by Michael Scott, the first president of Apple Computer (1977-81), in 1987 and almost completed within a… Continue reading

By Dr Shihaan | Comments (0)

List of faceted rubies greater than 10-carats in weight

May 5, 2008 – 3:36 pm

List of gem-quality faceted rubies greater than 10-carats in weight arranged in descending order of weights

S/N

Name

Carat Weight
Origin
Cut-Shape

Present Owner

1
Prince’s Ruby
174.67
unknown
unknown
Bowers Museum

2
Rosser Reeves
138.70
Sri Lanka
cabochon star
NMNH Smithsonian

3
DeLong Star
100.32
Burma
cabochon star
AMNH New York

4
Nga Mauk
98.00
Mogok Burma
unknown
unknown

5
Kallahpyan
74.00
Mogok Burma
unknown
unknown

6
Maung Lin-1
70.00
Burma
unknown
unknown

7
J.P.Morgan-2
67.00
Sri Lanka
asymmetrical
AMNH New York

8
Mandalay
48.019
Mogok Burma
cushion
unknown

9
J.P.Morgan-1
47.00
Burma
irregular cabchon
AMNH New York

10
Unnamed
46.75
Burma
oblong
unknown

11
Maung Lin-2
45.00
Burma
unknown
unknown

12
Forster-2
39.50
Mogok Burma
drop-shaped
unknown

13
Unnamed-set world record price for single ruby
38.12
Burma
cabochon
sold 1993 by Burma Gems Enterprise

14
Unnamed
36.00
Burma
unknown
sold by Mindon Min for £30,000

15
Unnamed-set… Continue reading

By Dr Shihaan | Also posted in Gemstone and Jewellery Industry News, Ruby | Comments (1)

J. N. Forster Rubies

May 3, 2008 – 6:26 am

Origin of name

Two large rubies belonging to the Burmese royal family weighing 37 carats and 47 carats were brought into England in 1875 for sale in the British market. J. N. Forster decided to re-cut the two stones as they did not conform to British standards. The smaller stone was… Continue reading

By Dr Shihaan | Also posted in Ruby | Comments (0)

Nga Mauk & Kallahpyan Rubies

May 1, 2008 – 4:50 pm

Origin of name

The two rubies “Nga Mauk” and “Kallahpyan” are believed to have originated from the same enormous 560-carat Mogok ruby, which happened to be subsequently split into two. The larger part which was given to the king, was cut and polished into a 98-carat finished stone and… Continue reading

By Dr Shihaan | Also posted in Ruby | Comments (1)

Peace Ruby

April 30, 2008 – 7:07 pm

Origin of name

The 42-carat, pigeon’s-blood color, rough ruby was discovered in the Mogok valley on June 30, 1919, just two days after the signing of the Treaty of Versailles on June 28, 1919, a peace document signed by the Allies and Germany at the end of World War I… Continue reading

By Dr Shihaan | Also posted in Ruby | Comments (3)

Chhatrapati Manik Ruby

April 30, 2008 – 4:02 am

Origin of name

The “Chhatrapati Manik Ruby” which according to legend is one of the oldest rubies in the world dating back to 380-415 AD, the period of rule of the powerful emperor of northern India, Candragupta II, also known as Vikramaditya (son of valour), gets its name from… Continue reading

By Dr Shihaan | Also posted in Ruby | Comments (1)

Alan Caplan Ruby - Mogok Ruby

April 27, 2008 – 5:11 pm

Origin of name

“Alan Caplan Ruby” also known as the “Mogok Ruby” gets its name from Alan Caplan the famous geologist and mineralogist and also mineral and gemstone dealer who acquired the stone while on a trip to Burma in the 1960s or 1970s. The ruby remained in his… Continue reading

By Dr Shihaan | Also posted in Ruby | Comments (2)