Xaurum [XAUR] is an ERC20 (Ethereum) token backed by an ever increasing amount of Gold and has been going strong for over a year, It has even passed a compliance review by Bittrex which convinced me to invest a little:

so far it's been a good investment for me, but like with any digital gold it relies on trusting whoever stores the gold to remain compliant and solvent when shit hits the fan. that's why many gold bugs prefer holding physical gold at home.
Bitshares "gold" seems interesting but I don't think you can actually exchange the bitgold for actual gold (it is just an asset , like Tether USD), instead with Xaurum at any point you can exchange the xaurum for physical gold which gets shipped to you worldwide in 1g bars/cards
https://support.bittrex.com/hc/en-us/articles/227902667-What-is-a-compliance-review- http://www.xaurum.org/