Sunday, 18 April 2021

Melo pearl

Melo pearls are large and non-nacreous, and are found naturally in the Melo Melo sea snail. Pearls fall into one of two varieties, nacreous and non-nacreous. Nacreous pearls are formed out of the material nacre and generally have a high luster. Non-nacreous pearls are generally less valuable with some exceptions. Melo pearls are one.
Most pearls in jewelry are cultured by farmers under controlled conditions, but there are some natural pearls whose origins can’t be created. The Melo Melo pearl is among them, making them extremely valuable. Melo Melo pearls can take decades to grow to significant size.
The Melo Melo is found in Southeast Asia, Burma, Thailand, Malaysia, the South China Sea and the Philippines.

Wednesday, 7 April 2021

Coloured Diamonds shine at Christies

The Perfect Palette,’ a trio of colored diamonds collectively achieved $8,370,000. Each stone surpassed initial estimates. The fancy vivid purplish pink diamond ring of 2.17 carats sold for $3,510,000; the fancy vivid blue diamond ring of 2.13 carats realizing $2,670,000; and the fancy vivid orange diamond ring of 2.34 carats made $2,190,000.
Fancy vivid purplish pink cut-cornered square modified brilliant-cut diamond of 2.17 carats, round diamonds, platinum and 18k yellow gold. $1.5m to $2.5m. The New York April Magnificent Jewels sale offers over 200 lots, highlighted by colored diamonds. “The Perfect Palette,” is a collection of three rings. Fancy vivid orange cut-cornered rectangular modified brilliant-cut diamond of 2.34 carats, platinum and 18k yellow gold. $1.5m to $2.5m.

Fancy vivid blue cut-cornered rectangular modified brilliant-cut diamond of 2.13 carats, round diamonds, platinum. $2.5m to $3m.

Sunday, 28 March 2021

Bejeweled Birds

The Peacock Brooch by Graff boasts 1,305 diamonds weighing a total of 120.81 carats.

At the center is a 20.02-carat fancy deep blue pear-shape diamond, one of the rarest blue diamonds in the world. Adorning the tail feathers is an array of white, pink, yellow, orange, green and blue diamonds in various sizes and shapes. The tip of each feather is set with a cluster of white diamonds. The Peacock Brooch made its first public appearance in 2016 and reportedly can be yours for about $100m.

The “Walska Briolette Diamond” Brooch by Van Cleef & Arpels. The Fancy Vivid Yellow antique briolette diamond weighs 96.62 carats. $10.5 million




Cartier

Coral, emerald, diamond and onyx parrot brooch, Van Cleef & Arpels, circa 1990

'Bird of Paradise' brooch, Van Cleef & Arpels,

Lovebirds clip, 1946. Van Cleef & Arpels

Friday, 26 March 2021

Mandarin Spessartite Garnet

Mandarin Spessartite Garnet is a rare form of orange garnet colored by manganese.

The combination of vivid color and high refractive index make spessartite garnet one of the most brilliant stones in the world of colored gems. Its hardness is around 6.5 - 7.5 on the Mohs scale, making it ideal for jewelry.
The gems occur in a range of colors from yellowish orange to reddish orange and orange-red. The pure orange, known as mandarin or fanta orange, is very rare and has been found in only a few deposits in Africa, notably in Nigeria.

Top spessartites are highly sought after by gem collectors and are considered investment grade. Very little in the way of new material has been found recently.
The prices and value of spessartite garnet varies according to the size and quality of the gemstone. Color and clarity are the most important factors. Vivid orange is the most valuable. The reddish and orange-red are also valuable in fine quality. Gems with a distinct brownish hue, or heavily included stones, are less valuable.

Spessartites are not currently enhanced by any method.
Harry Winston

Tuesday, 23 March 2021

Cartier leads at Sothebys

The Art Deco-inspired piece took almost 2,000 hours to create. A Cartier bracelet featuring a flawless D-color 63.66-carat pear-shaped white diamond will be auctioned at Sotheby's Hong Kong with an estimate of $5.1m to $8.4m. Also headlining is the Circle of Happiness jadeite bangle weighing 277.673 carats

Sunday, 21 March 2021

Gemstone faceting - Hearts and Arrows

The commercial realities of gem-cutting means there is little emphasis placed on high-quality gemstone faceting. To obtain as great a carat yield as possible from rough, various methods are used to squeeze cuts out of the gemstone while bypassing visible inclusions at the expense of symmetry. Since each carat is real money, gem-cutters and sellers shut their eyes to optical defects.
Gemstone laboratories have systems of grading cuts, but they prefer not to draw attention to it as they don’t want to reduce the appeal of the gemstone. High-quality gem cutting ensures the perfect flatness of facet surfaces that increase a gemstone’s ‘fire’. Fire produces sparkle – light patches of colour different from the main colour of a gemstone – and is one of the advantages of a faceted gemstone. The quality of faceting is not shown in gemstone certificates.
When it comes to diamonds, the hearts and arrows diamond is the masterpiece. What is 'hearts and arrows'? When viewed from the top (crown), an ideally cut diamond should reveal eight symmetrical arrows. When the diamond is viewed from the bottom (pavilion), it should reveal eight symmetrical hearts. Not all diamonds with an ideal cut rating (AGS) or excellent cut rating (GIA) will automatically qualify as a hearts and arrows diamond. The formation of a precise patterning is due to extreme care that is taken when polishing each facet to exact angles and proportions. This level of precision goes far beyond the criteria needed to achieve a “excellent” symmetry rating.
There is a premium placed on super ideal cut diamonds, and while vendors advertise their inventories with fanciful marketing, the details are essential.
The hearts patterning is particularly critical.

Properly formed hearts require super precise facet placements and proportioning. Any slight deviations in facet alignments will show up in the pavilion view.