8.3-carat Paraíba tourmaline fetches $18,625 in no-reserve live auction

An 8.314-carat Paraíba tourmaline sold for US$18,625 on Oct. 15 in a live online auction on Gem Rock Auctions after opening at US$1 with no reserve. The Mozambique stone drew 72 bids and was verified by Bellerophon Gemlab as untreated, highlighting strong demand for rare colored gemstones in real-time bidding.

Why it matters: - The sale shows how live online auctions can surface market pricing for rare gemstones in a single session. - The stone’s no-reserve format helped turn bidder competition into a clear price signal. - The final result works out to about US$2,240 per carat for a gem of a size that often trades privately or through traditional auction houses.

What happened: - An 8.314-carat Paraíba tourmaline sold for US$18,625 on Oct. 15 on Gem Rock Auctions. - The stone opened at US$1 with no reserve during a live show run by The Gem Portal. - The auction drew 72 bids for the stone and 1,244 bids across the live show. - The buyer was in Australia. - The live session started at 10:30 p.m. New York time on Oct. 14, which was 12:30 p.m. AEST on Oct. 15.

The details: - The faceted oval measures 14.90 x 12.28 x 7.37 mm. - Bellerophon Gemlab in Paris identified the stone as a natural Paraíba tourmaline from Mavuco, Mozambique. - The lab report, B79430, is dated Sept. 30, 2026. - The report found no indications of treatment. - The verification can be checked on the Bellerophon Gemlab website at verification page using the report number. - The auction listing shows the full bid history. - Live shows on Gem Rock Auctions are streamed by verified sellers, with registered bidders placing bids in real time while the seller presents each item on camera. - Bidders must hold a verified account before bidding. - Paraíba tourmaline is a copper-bearing variety of tourmaline. - The gemstone was first found in Brazil's Paraíba state in the late 1980s and later in Nigeria and Mozambique.

Between the lines: - The format favors price discovery, especially for stones that are rare enough to attract specialist buyers but difficult to benchmark. - A no-reserve opening can widen participation and push bidding faster when multiple buyers want the same lot. - The market response suggests continued demand for Mozambique-sourced Paraíba material with lab documentation. - Ross Sedawie, COO of Gem Rock Auctions, said: “We started it at one dollar with no reserve and let the bidders decide. Seventy-two bids later, the market had set the price live, in front of everyone.”

What's next: - High-resolution images and video of the stone are available on request. - Gem Rock Auctions says it will continue offering gemstones, minerals and jewelry through auctions, fixed-price listings and live auction shows. - The Gem Portal will continue sourcing a wide range of colored gemstone varieties from Bangkok, Thailand.

The bottom line: - A rare, untreated Paraíba tourmaline, sold with a $1 start and no reserve, showed how live online bidding can quickly convert scarcity into a market-clearing price.