Quartz (Clear, Smoky, Rose, Amethyst, Citrine, etc.)

Carat weight has a modest influence for most quartz varieties, as large crystals are common and relatively inexpensive. However, very large, fine amethyst, citrine or rock crystal pieces used in statement jewelry or carvings can achieve higher absolute values due to scale and design.

Color is the primary value driver across quartz varieties. Deep, saturated, even purple is prized in amethyst; rich yellow to reddish-orange in citrine; uniform delicate pink in rose quartz; and attractive smokiness in smoky quartz. Uneven, overly pale or muddy colors are less desirable. Many quartz colors can be influenced by heat or irradiation treatments.

Faceted quartz is generally expected to be eye-clean or nearly so. Obvious inclusions, fractures or cloudiness reduce value, except where inclusions are intentionally featured (e.g., rutilated quartz). Rock crystal and high-quality amethyst and citrine often achieve very good clarity at low cost.

Cut quality significantly affects the visual appeal of quartz gems, especially given their high transparency. Well-executed brilliant and mixed cuts maximize brightness and minimize windowing. Designer and fantasy cuts are also common due to abundant, affordable rough.

Quartz deposits are global and extensive, including major sources in Brazil, Uruguay, Madagascar and many other countries. Gem-quality quartz varieties are mined in large quantities, ensuring ample supply for the jewelry industry at most quality levels.

Demand for quartz is broad, covering everything from low-cost mass-market jewelry to designer pieces using large, custom-cut gems. Amethyst and citrine have long been staples in colored-stone jewelry, while rose quartz, smoky quartz and clear quartz enjoy popularity in both metaphysical and fashion segments.

Recent Trends: steady demand from the broader jewelry market, with gradual growth in online and designer channels for well-cut, natural stones.