In response to growing market demand John Pye Luxury Assets will be holding its first tender auction of precious gemstones, with lots ending at 3pm BST on Thursday June 16.

The market for coloured gemstones has been growing steadily over the past few years, and this tender auction offers gemstone jewellery designers, retailers and investors an opportunity to purchase high quality precious and semi-precious cut and polished stones.

The sale comprises a collection of 26 loose cut and polished natural emeralds from the Southern African Kagem Old Mine, located in Zambia. After Columbia, Zambia is the world’s second biggest producer of emerald, with its Kagem Mines, in the Kafubu River area, depositing around 20% of the world’s production of gem quality stones. During the last three years, Kagem has produced an average of 6.5 million carats of emeralds per annum.


Zambian emeralds are widely recognised for their own distinctive characteristics of excellent transparency, brilliance and a deep emerald green colour. The 26 stones included in this sale are both square and oval cut, and carat weights range from approximately two to 20 carats.

A small group of six high quality natural, unheated rubies from Mozambique will follow the emerald stock, all of which come certificated by the International Gemmological Institute. The six rubies are all approximately one carat, and are a mixture of rectangular cushion and oval cuts.

The auction continues with another small consignment of natural blue, pink and orange sapphires, and one padparadscha sapphire. The seven gemstones originate from Sri Lanka, the island from which the most sought after sapphires derive. The stones range from 0.3 to five carats.

A selection of small fancy coloured and white diamonds comprise the final section of the auction. An area of the gemstone auction market that has grown significantly in the last five to 10 years, fancy coloured diamonds are now appreciated widely for their rarity and beauty. Of all the colours, the pink diamonds are the most sought after, and included in the sale are four, of various sizes and weights.

All under a carat, the diamonds are available to view online, along with rest of the auction, on John Pye Luxury Assets’ website.

Viewing of the items will be available at the auction company’s Nottingham saleroom on Tuesday June 14 from 11am-1pm, and at the Bond Street saleroom from 11am-7pm on Wednesday June 15, and from 11am-2pm on Thursday June 16.

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Editor, Professional Jeweller