Yellow Quartz Tumbled Gemstone

Safe to handle and wear. Much Yellow Quartz on the market is heat-treated or irradiated quartz; heat-treated color is stable, but irradiated Lemon Quartz can fade with prolonged strong sunlight or high heat. Not intended for elixirs or internal use.

Yellow Quartz has no single discovery date because it has never been rare enough to need one. Sun-colored quartz turns up wherever quartz grows, and for most of history it was simply lumped in with topaz or citrine. The trade name Yellow Quartz came into its own once gem dealers began separating the pale, milky, softly translucent yellow material from the deeper, transparent citrine prized as a faceted gem. Today the name covers naturally colored quartz from Brazil, Madagascar, Russia, and the United States, as well as colorless, smoky, or amethyst quartz whose yellow was coaxed out by heat or irradiation.

Yellow Quartz is silicon dioxide, SiO2, the same trigonal quartz that forms clear quartz, amethyst, and citrine. There is no scientific consensus on the cause of natural yellow color: it is linked either to aluminium-based color centers created by natural radiation or to trace iron. In heat-treated amethyst and smoky quartz, the yellow comes from fine iron-oxide particles of hematite and goethite, while colorless quartz irradiated in a lab becomes the neon yellow to yellow-green material sold as Lemon Quartz. It rates 7 on the Mohs scale, has no cleavage, breaks with a conchoidal fracture, and shows a vitreous luster on fresh surfaces and a soft waxy glow when tumbled.

• Yellow quartz shares its mineral identity with citrine, and the ancient Egyptians are believed to have shaped golden quartz into talismans, prizing its sunlit color long before the two names were separated.
• In the Hellenistic world, Greek artisans carved yellow quartz into intaglios and symbols, and Roman priests are said to have worn it set in rings, a lineage that still shapes how the stone is regarded today.
• For centuries almost any golden-yellow stone was sold as topaz, and yellow quartz travelled under that borrowed name until modern mineralogy, with its tests of hardness and optics, finally told the two apart.