Hello everyone. I registered here because of coins, but I cannot miss to write my first post here
I believe there is only one rule in investment - you should know what you are doing! Thats why I agree with 1for1 - every diamond can be an investment.
Oldsoul - good collection

If you use the macro mode or a macro lens with a light source from above (usually, if you use white paper will be better) you will take much better pictures
So - about me - appart form the gold and silver coins I have, I do have quite a collection of colour stones and diamonds. The first diamond I bought online on an auction - 0.44 pear cut, SI3 fancy brown diamond IGL certified for.... 60$. From then I just love to "hunt" for diamonds on auctions. I can admit that they are not an "investment" grade, as I cannot afford to pay few thousands $$ for a diamond, but to be honest it makes them easier to sell. About a month ago I needed money and sold 6 diamonds within 3 days with average profit of 40%. But I have one rule about diamonds - they should be not only certified, but either with laser engraved number or closed in a certificate. I will never ever buy not certified gemstone! I like the diamonds but really love my 350ct citrine, 3 ct tanzanite and 4 black pearls.
And at the end - I collect gemstones and diamonds because I love them. I believe even when you invest, you should like what you buy not just to stack it
Cheers
Sorry if there are any errors - English is not my native language.