Thursday, 4 March 2021

Van Cleef & Arpels - High Jewelry

Van Cleef & Arpels is a French jewelry, watch, and perfume company.

It was founded in 1896 by Alfred Van Cleef and his brother-in-law Salomon Arpels. Van Cleef & Arpels are known for their expertise in precious stones and for a gem-setting procedure known as the Mystery Setting. The Mystery Setting is a proprietary mounting technique for gems. There are no visible prongs; instead the individual stones are hand grooved to fit into a mesh of gold or platinum wire.
This type of setting was perfected by Van Cleef & Arpels in the 1930s.
Since its inception, Van Cleef & Arpels has been synonymous with royalty, the famous and the affluent, providing the elite with exceptional and unique pieces of jewellery.

Wednesday, 3 March 2021

Famous Diamonds Examined by the GIA

The Hope Diamond. GIA graded the cushion antique brilliant of 45.52 carats as Fancy dark grayish blue.

GIA described the 41 carat Dresden Green as Fancy green, with a modified pear-shaped brilliant cut. The green has medium tone and slightly grayish saturation.
The Portuguese Diamond weighs 127.01 carats and is colour graded M with a VS1 clarity. The Portuguese has a strong blue fluorescence.

The Idol’s Eye weighs 70.20 carats. Its colour grade is Very Light blue and its clarity is VVS1.
Ocean Dream - Fancy Deep blue-green, 5.51 carats.
The 33.19 ct Asscher cut Elizabeth Taylor Diamond.
The Mouna weighs 112.53 carats and is Fancy Intense Yellow.
The Moussaieff Red weighs 5.11 carats and is the largest pure red diamond known to exist. It was cut and polished from a 13.9 carat rough.

The 30.62 carat Fancy Deep blue Blue Heart Diamond.
The two stone Bvgari Blue made $ 15.76m at auction. It features a 10.95 carat VS2 Fancy Vivid blue diamond, and an 8.87 carat G colour VS1 diamond.

The Pumpkin Diamond is Fancy Vivid orange and 5.54 carats.
The 59.60 carat Flawless Fancy Vivid pink Pink Star was formerly known as the Steinmetz Pink.

The 101.29 carat cushion cut Allnatt is graded Fancy Vivid yellow.

Tuesday, 2 March 2021

Mara Mamba Tiger Eye

Mara Mamba Tiger Eye is a rare variety of Tiger Eye found only in the Hamersley Ranges of the Pilbara region in Western Australia. Only two deposits have ever produced “true” Mara Mamba, a rare type with reds, blues, yellow, gold and greens. In 2005, David Vaughan discovered one of the largest tiger eye specimens ever at Marra Mamba.
Mara Mamba is extremely old, forming when the Earth had little to no oxygen in its atmosphere. Oxygen producing photosynthetic bacteria evolved more than 2.7b years ago, and gave off oxygen as a waste product. This oxygen built up in the atmosphere and dissolved in the sea water. When iron came in contact with this oxygen, it precipitated as iron oxide in the sea floor and resulted in iron-rich and silica-rich bands, called banded iron formations (BIFs).
Gems are usually given a cabochon cut to best display their chatoyance. (cat's eye effect)

Monday, 1 March 2021

Paraiba tourmaline giving shine to high end watches

Hublot’s Big Bang Paraiba is set with up to 224 paraiba tourmalines. Prices range between $232,000 and $274,000.Paraiba is perfect for watches because it retains some of its sizzle even when set flush. Compared to the prong setting of a ring, setting a gem into metal blocks light from entering the pavilion and out through the top, which can make diamonds look dull. Paraiba is the exception to this drawback. Watches set with the gem retain a glow.
See ----->Paraiba tourmaline - World's most desirable Gemstone

Sunday, 28 February 2021

King Tut's jewels made of desert glass

In 1922 Howard Carter was searching the tomb of Tutankhamun and found a large breastplate, decorated with gold, silver, various precious jewels and a strange gemstone. Carter identified it as chalcedony, a common variety of quartz.

Ten years later pieces of glass were found in the Libyan Desert along the border of modern Egypt. The pale yellow and translucent material was identical to that found in Tutankhamun's tomb.
Libyan Desert glass (LDG), is an impactite with fragments found over areas of tens of square kilometers.
Tektites are natural glass formed from terrestrial debris ejected high into Earth's atmosphere during meteorite impacts. LDG is almost pure silicon-dioxide, like quartz, but its crystal structure is different. It also contains in traces an unusual combination of elements, like iron, nickel, chromium, cobalt and iridium.
It's thought LDG formed 28 to 26 million years ago when an impact melted the quartz-rich sands of the desert.