The stones were taken from the Norman shell tower at Cardiff Castle, with bids starting at £300.Read more
eBay is to open a "concept store" as part of a partnership with businesses in Wolverhampton, in a bid to grow trade.
The company has been working with small businesses in the city and hopes the pop-up store will offer them the chance to "showcase" their products.
Around 40 small companies will be involved in the month-long scheme in what is being described as a retail experiment.
Rob Hattrell, vice president of eBay in the UK, said: "They have achieved more than £2m in sales as of March and many have employed more staff as a direct result of the partnership.
"This pop-up store aims to take that growth, and the value of this programme, to the next level."
Ebay has beaten quarterly sales forecasts thanks to a jump in Christmas shopping spending.
The online marketplace reported sales of $2.88bn in the three months to the end of the year, 6.3% higher than the same period last year.
Net income from continuing operations was $763 million or 80 cents per share, compared with a loss of $2.6bn or $2.51 per share, a year earlier, when it recorded a one-time tax-related expense of more than $3bn.
Debris said to be from the crash involving the Duke of Edinburgh has been put up for sale on eBay.
Enterprising seller morbius777 claimed the parts were from the collision near King's Lynn, Norfolk, on Thursday.
The listing said the items "may even have Phil's DNA on it, if you wanted to clone him or anything".
Whatever you think of that, the seller claimed that all money raised from the online auction would go to Cancer Research UK - and bids have topped £65,900!
A scheme which has seen small businesses in Wolverhampton get online advice from auction website eBay has generated £1m in sales in three months, it's claimed.
The city council says 64 firms have joined the Retail Revival partnership since it was launched in September.
It adds that retailers have reported an average increase in sales of 41% over the three months. The pilot project's set to run until September this year.