Welcome to UMA S.A
Gold, diamonds and precious metals: a committed African partner for a transparent and sustainable industry.
From Yaoundé, Cameroon
United Gemstones Africa and Precious Metals S.A
UMA S.A brings together a group of young Africans committed to the sustainable development of the continent's extractive resources, through a comprehensive and reliable partnership serving Africa's economic renaissance.
UMA S.A aims to become one of the leading companies in the marketing, mining and production of gold, diamonds and related substances in Cameroon and worldwide, all the way to jewellery, traditional gold artwork and luxury silver and diamond items.
Our services
We are committed to transforming Africa's mining sector by making it more transparent, ethical and sustainable.
AOG technology
An innovative technology to optimise the extraction and processing of precious metals.
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Marketing and distribution
A worldwide distribution network for marketing precious metals and rough diamonds.
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Sustainable development
A commitment to ethical and environmentally friendly mining practices.
Learn moreUMA S.A in pictures
What we do
From ore to certified bar, we master every step of the value chain.
Precious metal refining
Cutting-edge technologies to refine gold, silver and other precious metals to a purity of up to 99.99%.
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Rough diamond trading
We facilitate access to rough diamonds from verified sources, in line with the Kimberley Process.
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Innovation and excellence
We invest in research and development to stay at the forefront of technology.
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Global partnerships
Strong partnerships around the world to secure reliable supply and international outlets.
Learn moreGold price
Indicative prices based on the world gold price, updated regularly.
Gold price per ounce
€3,493.45per ounce
€112.32 per gram
Updated November 2, 2026 at 1:48 PM
| Bar | Indicative price | Rate | Order |
|---|---|---|---|
 1 kg gold bar | €112,317 | 7 % | OrderOrder — 1 kg gold bar |
 500 g gold bar | €56,158 | 7 % | OrderOrder — 500 g gold bar |
 250 g gold bar | €28,079 | 7 % | OrderOrder — 250 g gold bar |
 100 g gold bar | €11,232 | 7 % | OrderOrder — 100 g gold bar |
 50 g gold bar | €5,616 | 7 % | OrderOrder — 50 g gold bar |
Need help acquiring precious metals or rough diamonds?
Our experienced teams answer your questions, guide you through the buying process and offer solutions tailored to your needs.
Contact usOur partners
Recognised players in the precious metals and diamond industry.
