Gemstones of The Enlightened

On Wednesday, a cache of dazzling jewels linked to the Buddha's mortal remains, which have been hailed as one of the most astonishing archaeological finds of the modern era, will go under the hammer at Sotheby's in Hong Kong.

For over a century these relics, unearthed from a dusty mound in northern India in 1898, have sat largely unseen, cradled by a private British collection.

Now, as the gems prepare to leave the custody of their keepers, they are stirring not just collectors' appetites but also some unease.

They come from a glittering hoard of nearly 1,800 pearls, rubies, topaz, sapphires, and patterned gold sheets, first glimpsed deep inside a brick chamber in present-day Uttar Pradesh in India, near the Buddha's birthplace.

Their discovery – alongside bone fragments identified by an inscribed urn as belonging to the Buddha himself – reverberated through the world of archaeology. Nicolas Chow, chairman of Sotheby's Asia and worldwide head of Asian Art, believes this is "among the most extraordinary archaeological discoveries of all time".

Yet as these relics now face the glare of the auction room, experts tell the BBC that a question hangs heavy: can the sale of treasures so intimately woven into India's sacred past be considered ethical?

In 1898, William Claxton Peppé, an English estate manager, excavated a stupa at Piprahwa, just south of Lumbini, where the Buddha is believed to have been born. He uncovered relics inscribed and consecrated nearly 2,000 years ago.

Historians agree these relics, intact until then, are the heritage of both the Buddha's Sakya clan descendants and Buddhists worldwide. The bone relics have since been distributed to countries such as Thailand, Sri Lanka and Myanmar, where they continue to be venerated.

"Are the relics of the Buddha a commodity that can be treated like a work of art to be sold on the market?" wonders Naman Ahuja, a Delhi-based art historian. "And since they aren't, how is the seller ethically authorised to auction them?

"Since the seller is termed the 'custodian', I would like to ask – custodian on whose behalf? Does custodianship permit them now to sell these relics?"

Chris Peppé, great-grandson of William, told the BBC the family looked into donating the relics, but all options presented problems and an auction seemed the "fairest and most transparent way to transfer these relics to Buddhists".

Julian King, Sotheby's international specialist and head of sale, Himalayan Art, New York told the BBC the auction house had made a thorough review of the jewels.

"As is the case with any important items and collectibles that are offered for sale at Sotheby's, we conducted requisite due diligence, including in relation to authenticity and provenance, legality and other considerations in line with our policies and industry standards for artworks and treasures," King said.

Ashley Thompson, of Soas University of London, and curator Conan Cheong, both experts in Southeast Asian art, have more questions. In a joint statement they told the BBC: "Other ethical questions raised by the sale are: should human remains be traded? And who gets to decide what are human remains or not? For many Buddhist practitioners around the world, the gems on sale are part and parcel of the bones and ash."

The sale of the relics has also sparked concern among Buddhist leaders.

"The Buddha teaches us not to take other people's possessions without permission," Amal Abeyawardene of London-based British MahaBodhi Society, told the BBC. "Historical records indicate that the Sakyamuni clan were granted custody of these relics, as the Buddha emanated from their community. Their wish was for these relics to be preserved alongside adornments, such as these gems, so that they may be venerated in perpetuity by the Buddha's followers."

- Author: Soutik Biswas, BBC