Month: November 2017

Reigniting Diamond Desire

Depressed demand for jewelry is hurting everyone—from miners to retailers—in the supply chain. The GemGuide talked to industry leaders to explore opportunities for change and learn how to reignite consumer passion for our product. De Beers…

The Big Three Plus Diamond

The GemGuide has now been publishing colored gemstone prices since 1982 and diamond prices since 1985. During the past 35 years, gem prices have fluctuated for various reasons. The chart that appears below is a…

Rhodochrosite

Rhodochrosite has been used as an ornamental material for carvings, beads and inlays due to its low hardness, for a very long time. Beautiful pink color contrasting with white banding in massive form is the…

The Rarity of Tanzanite

In 1967, blue-violet crystals of the mineral species, zoisite, were discovered south of Mount Kilimanjaro in northeast Tanzania. The host rocks of the discovery, which are orders of magnitude older than Africa’s highest mountain, form…