After all this time I am somewhat amazed that HelloGold and GOLDX are not included here as gold backed stable coins considering that :

HelloGold has had a gold backed token available for almost a year.

HelloGold’s GOLDX is the only fully allocated, open source blockchain tokenised gold currently available to the best of our our knowledge.

HelloGold’s GOLDX is shariah compliant which is important to many people in Asia, Africa and the Middle East.

HelloGold’s GOLDX is part of a larger real world solution that helps people in emerging economies hedge against the volatility of their currencies buying with funds from online banking or mobile wallets and allowing collateralisation for loans etc.

Given that for many non US economies, the USD is not itself a measure of stability, gold has a significant attraction as a stable store of value.