Barnebys co-founder Pontus Silfverstolpe said: "Next time your partner says she wants a handbag and the price horrifies you, just think that it may in fact prove to be an investment.
"The value of these bags are linked to their limited availability, the rare quality of their materials, the elegance of their design and the condition they are in and also at times who owned them previously.
"Specialists at the auction houses advise that they be treated like any other rare investment and kept in a bank vault."
Mr Silfverstolpe said the surge in value was being fuelled to a large extent by buyers from Asian countries, especially China.
Before last year's world record handbag sale, the record had been £142,000 ($257,522) set in 2011 for a gold and diamond Hermes Birkin that had belonged to Elizabeth Taylor.
The Gaultier one went for more because only two had ever been made.
Handbags tend to accumulate in value even when the economy is in a downturn because they remain as status symbols for the richest women in the world, who are usually recession proof.
An index of auction item investments showed collectible handbags increased by an average eight per cent a year between 2004 and 2016.