Sunday, 17 September 2023

Famous diamonds examined by the GIA

The Hope Diamond may be the most famous coloured diamond in the world. 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.
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 Ocean Dream is 5.51 carats and Fancy Deep Blue-Green

Friday, 15 September 2023

Heidi Horten jewels

The World of Heidi Horten May sale series realized a total of US$202m, surpassing the US$162m low estimate for the three auctions. It became the most expensive private jewelry collection ever to appear at auction.
The 90-carat “Briolette of India” diamond necklace by Harry Winston came in below estimate, selling for $7m. The 'Sunrise Ruby' by Cartier fetched $14.5m. It last sold for $30.4m.
'

Saturday, 9 September 2023

Finest opal ever

Billed as the “finest opal ever,” the Virgin Rainbow made its world debut at the South Australian Museum in Adelaide as the centerpiece of a larger exhibition to commemorate the centenary of opal mining in Australia.
Veteran miner John Dunstan is credited with discovering the Virgin Rainbow in the desert soil of Coober Pedy in South Australia in 2003. Dustan has mined opals for 50 years, but the internal fire of the Virgin Rainbow is unlike anything he’s ever seen.

Gibber plain near Coober Pedy
The Virgin Rainbow is a Belemnite pipe, which is an opal that formed in the skeleton of an extinct ancestor of the common cuttlefish. It is a once-in-a-lifetime discovery.
Coober Pedy is often called “The Opal Capital of the World.” The discovery of gem opals sparked a rush of mining activity that has generated top-quality gems for the past 100 years.

Australia produces more than 90% of the world’s precious opals.
Between 100m and 97m years ago, Australia’s vast inland sea began retreating. As the sea regressed, a rare episode of acidic weather was taking place, exposing pyrite minerals and releasing sulphuric acid.

As the surface of the basin dried further and cracked, silica-rich gel became trapped in the veins of the rock. Over eons, the silica solidified to form opals
Coober Pedy, an Aboriginal name meaning "White man in a hole",  describes the mines and dwellings - burrows dug into the scarp to escape soaring temperatures of the day and the freezing winds at night.

Friday, 8 September 2023

Cartier Birds

Cartier Bird of Paradise Brooch with 20.22-carat pink sapphire and six padparadscha sapphires.
Société Cartier designs, manufactures, distributes and sells jewellery and watches. Founded in Paris in 1847 by Louis-François Cartier, the company remained under family control until 1964.

Ruby, sapphire, emerald, citrine and diamond flamingo clip. Cartier 1940.

Cartier 1950s Emerald Ruby Sapphire Diamond Parrot Brooch
The company's headquarters is in Paris and it is now a wholly owned subsidiary of Compagnie Financière Richemont SA. Cartier has a long history of sales to royalty and celebrities.  King Edward VII of England referred to Cartier as "the jeweller of kings and the king of jewellers.

Morganite, Pearl, Onyx, Pink Sapphire and Mother of Pearl Bird Brooch