Beautiful in its simplicity, the ring is offered in captivating hues like scarlet garnets, brown and lemon quartzes, and purple amethysts.

WSJ: The Cult of Pomellato | Jewelry

Another piece, a gold brooch set with an ancient gold coin that pictures Philip II of Macedonia, has patterns made of diamonds, blue topazes, amethysts, peridots, and pink and red tourmalines.

FORBES: Flight to quality

Gemfields owns a majority stake of the Kagem mine in Zambia, which produces emeralds and amethysts, a mine in Mozambique for ruby, and prospecting licenses for other gemstones in Madagascar.

FORBES: Faberg�� Completes Merger with Colored Gemstone Company

Among the brooches is a spectacular creation in which an octopus attacks a butterfly, designed by Germany's Wilhelm Lucas von Cranach from 1900 and executed in pearls, gold, rubies, amethysts, topaz and enamels.

WSJ: A Love Affair With Pearl at Germany's Schmuckmuseum Pforzheim

The same mine also produces amethysts.

FORBES: Mila Kunis and Jewelry Designers On Hand For Emerald Jewelry Unveiling In London

The Kagem mine also produces amethysts.

FORBES: Mila Kunis Named Ambassador Of Emerald Company

Colored gemstone miner and marketer, Gemfields, brought its partnership with Mila Kunis and 36 jewelry designers to the public Thursday by unveiling a bespoke jewelry collection made with Zambian emeralds, Mozambican rubies and Zambian amethysts, along with its star ambassador at Phillips Auction House in London.

FORBES: Mila Kunis and Jewelry Designers On Hand For Emerald Jewelry Unveiling In London