Guptas Gems N Jewels manufactures Diamond Gems. Guptas Gems N Jewels also manufactures Indian Hand Crafted Gem - Studded Jewellery. Diamond Gems are the hardest mineral on the earth with a hardness of 10. The Gem is made of the uniform arrangement of their constituent carbon atoms. It is available in unique adamantine lustre. Colourless diamonds found in varieties of yellow, brown, green, pink, blue, red, grey and black. This Gem comes in old mine, cushion, princess, emerald, pendeloque and marquise cuts.