Ok - before I say this, let me just say that I very rarely buy from any of the jewellery outlets now as I prefer to get certified gemstones and buy direct from lapidarists so ......... in my opinion:
RocksTV has a specific market. It's low end, low quality (sorry but this is based on my experience) but priced correctly. They've always had seriously good CS and interact with customers brilliantly but I've been buying jewellery for years and don't buy anything, apart from the odd costume piece of jewellery from them (and I know I'm not the only jewellery collector to think this). They may stay afloat because they turn over lots of stock at the right price point. They will never though attract the same audience as TJC unless they change their products. I'm not criticising RocksTV at all because I have the greatest respect for the Bennetts. They've got a niche in the market and are working it well.
TJC is by far superior in that it has some stunningly well cut, well priced, well made items.
GemsTV have lost their way and certainly lost me forever as a customer with the recent debacle.
Rocks and Co just can't compete because they've pee'd off so many customers and don't listen to feedback. Like Marble, I don't know anybody who has Freeview. Everybody I know has Sky. If Freeview were that popular then ALL of the channels would have been on that and not Sky.