Dear Lifehacker, I was wondering if you can help me appraise some gold stud earrings I wish to sell? They're jadelite cream with a vintage apple design. Each piece has 11 diamonds on the back totaling 22. I can see hallmarks but can't quite make them out. I don't know their value or maker. I would appreciate any help!

Trying to set the price to sell something on eBay or Gumtree? The last two digits could matter a lot more than you realise, as Joshua Gans from the University of Toronto explains.

Thinking of selling something on eBay? From this week, your listings will be deleted if you don't meet the site's minimum image quality requirements.

The Australian online shopping and classifieds portal Quicksales has announced it has abolished all selling fees on its website. Effective immediately, sellers will be able to place as many sales listings as they like free of charge. Not coincidentally, the announcement was made on the same day that eBay increased its seller fees to 9.9 per cent.

eBay Australia is changing its fees yet again from May 1, pushing up insertion costs for cheaper items and increasing its final value charges. Here's what will change.

You can find some good bargains on eBay, but the competition in auctions can be tough. To score even better deals, you can search specifically for misspelled listings.

eBay Australia is revamping its customer service and help site. That's good news for eBay users, but bad news for 'Emma', the automated agent which eBay introduced last year to try and handle common questions. She's being dumped.

eBay has made one of its periodic increases to the maximum postage rates it allows in some categories (notably CDs and DVS). Australia Post increased its charges back in April, so the new rates reflect that, ensuring sellers can charge a vaguely fair price. Most notably, caps have been dropped altogether for books. eBay is also introducing a new fee structure this week.

Having said it would introduce a new fee structure on May 2, eBay Australia has now delayed its rollout until May 16. So if you were planning to take advantage of the free pictures option, you'll need to wait a couple of weeks.

eBay just can't stop tweaking its listing rules. In the latest round of changes, sellers actually get something: up to a dozen free pictures on every listing. But the news isn't so good on insertion fees.

The trial of allowing sellers on eBay to list any item without an insertion fee has apparently gone so well that the policy has gone into permanent effect. But as well as ultimately meaning you'll pay more money, items listed with the 'no insertion fee' policy may also now feature advertisements.

Back in May, eBay began listing results from its UK and US sites in amongst local products on its Australian site. Now local sellers are getting a partial payback: since October 19, some Australian listings are appearing on eBay.co.uk.

From October 10, eBay is going to start showing groups of results when searching for particular kinds of gadgets, rather than a vertical listing as it does in other categories. The change will affect items listed in the mobile phone, digital camera and Apple laptops categories.

The changes to eBay's fee structure which we first reported on back in July takes place today. As of now, the same final value fees apply whether you're selling an item via auction or at a fixed price.

Latest odd change from the world of eBay: from August 22, it will be cutting back on its categories to "make it easier for international buyers to find items". The three big areas where this might potentially impact Lifehacker readers are in mobile phones, modems and games. However, while the changes appear to offer less choices, there's not really any need to panic.

eBay Australia has made no secret of its desire to encourage new goods over second-hand ones, but this is the strongest evidence yet: from September 22, fees for auctions will be raised to match those charged for Buy It Now options. In other words: eBay doesn't really want to run your stinking auctions no more.

eBay is keen for you to buy goods, but rather less keen for you to get in touch when things go wrong. However, a recent revamp to its customer service portal does make it a little easier to go through that process.

eBay is continuing its push towards emphasising fixed-price goods from professional sellers, but that doesn't mean the process always goes smoothly. Back in February it announced plans to make it compulsory for all sellers to specify handling times and return policies. That was supposed to happen in May, but has now been delayed until August.

Since launching in Australia, eBay has always had a policy of placing local listings ahead and separately from those originating overseas. From today, that approach will change somewhat, with listings from the US and UK sites intermingled with those offered by Australians in a "variety of categories".