We proudly work with U.S. gems and gold suppliers only. They follow the US federal law and AGTA standards that commit to the industry of disclosure, transparency, and ethical practices. GOLDAll of our gold is supplied from U.S. vendors committed to ethical sourcing and environmental sustainability. This includes recycled gold in some manufacturing processes certified by SCS Global Services Certifications.DIAMONDSOur diamonds are sourced from one of the largest diamond dealers in the U.S. These diamonds originate from mines in Canada, Australia, Russia and South Africa that follow strict labor, trade, and environmental regulations. Additionally, we only work with US diamond dealers as US Customs Service enforces the Kimberley Process requirements as diamonds enter US ports. A single white diamond larger 0.5CT comes with a GIA certificate at free of charge.We provide GIA certificates for salt and pepper or smaller diamonds upon request only. The service fee will be applied. Contact us for more info. OTHER GEMSTONES FROM MIXED ORIGINS:Rough material of different origins gets mixed together on the chain of supply long before it gets to our US suppliers. What we can do here is to make sure we only work with suppliers who follow KPC regulations. Lab-grown white sapphire - Thailand.Sunstone - Oregon, USA. Opal - Australia. Turquoise - Australia, Chile, China, Mexico, USA.Pearl - Japan, China.