P Voudouris, S Karampelas, V Melfos, I Graham - 2020 - mdpi.com
Gems have been used in the manufacture of jewellery and as ornaments since antiquity. Considering gems, recent statistics have shown that about 15 billion Euros are annually at …
P Voudouris, S Karampelas, V Melfos, I Graham - 2020 - mdpi.com
Gems have been used in the manufacture of jewellery and as ornaments since antiquity. Considering gems, recent statistics have shown that about 15 billion Euros are annually at …