I believe that the high-quality opal specimens (set in 18k gold) are from his personal collection. They look gorgeous. Very colourful and twinkling.
This is why I never buy patterned stones from Gemporia. I like to know what I'm paying for.
Yes, there are a few stones that
could be from Steve's personal collection - the opals that you mention, plus perhaps the Csarite and highly likely the Tunduru Colour Change Sapphires that they sold at the weekend.
The Tunduru mine closed years ago - and Gemporia haven't sold it for about 6 years - so that is likely from Steve's vault.
But the dyed Chalcedony, filled Rubies and reconstituted Turquoise? All I can say is, if they tried to tell us that they're from Steve's personal vault to impress us or to imply that they are of a grade worth investing in, then i'd have serious reservations about Steve's integrity and gem knowledge because those stones are the worst quality available in those materials, they have very little worth, they will never increase in value, and they will NEVER be investment stones. If Rubies were not filled, they'd inevitably be scrap. If low quality Chalcedony was not dyed, it would either be bland and unpopular stuff with no colour - or it would be 'dirty' looking junk with loads of inclusions and impurities that make it ugly looking. The dyeing treatment is done to make it look visually appealing and 'sellable'.
Even the stones like Zircon. There's nothing wrong with Zircon. I actually really like Zircon - i'd have that over a Diamond any day of the week. But do I believe its out of Steve's vault? No. I believe its just stock that Gemporia have had for years. Gemporia ALWAYS have Zircon. It's their accent stone of choice on gold. Most gold jewellery has Zircon rather than diamond as accent stones. It's a not a rare stone - it's readily available. It's not expensive either. Will it have gone up in price since 2006 (the date they claimed they bought it) - yes, almost certainly. Will it have gone up by much? Unlikely. Probably nowhere near as much as he's spent on paying to supposedly store it in a vault in Geneva to store it...........
If I was someone like Steve Bennett, with plenty of money in the bank and access to some of the world best stones, I'd be investing in high quality natural or heat treated Rubies, high quality natural or heat treated Sapphires, high quality Emeralds, the very best Tanzanite with genuine 3-way pleochroism where blues, purples and reds can be seen in one stone, and genuinely ultra-rare stones such as Benitoite, Bixbite (Red Beryl), etc.
I wouldn't be interested in dyed Chalcedony or reconstituted stones even for my own personal collection - even if they were free. They're crap quality stones, worthless, visually bland and totally unappealing to me. I wouldn't pay someone to store them in their shed for me - let alone pay to store them in a 'private vault in Geneva'.