Amethyst Stone (Jamunia)

Amethyst is the violet-purple variety of macrocrystalline quartz (silicon dioxide, SiO₂):

• Gemological Color Origin: The purple color is caused by natural gamma irradiation of trace trivalent iron (Fe³⁺) impurities substituting for silicon within the quartz crystal lattice during formation over millions of years.
• Natural Color Zoning: Because quartz crystals grow in geometric rhombohedral layers, natural amethyst characteristically displays angular, chevron, or uneven color zoning (alternating bands of deeper violet and lighter lilac). Under immersion or magnification, this angular zoning is one sign of natural growth.
• Shade Range: Color ranges from delicate lavender-lilac (often termed “Rose de France”) to deep, velvety royal Siberian violet-purple with rich red or blue flash. Read our Amethyst Buying Guide for detailed grading factors.

Because synthetic hydrothermal amethyst has been manufactured commercially since the 1970s, rigorous laboratory testing is essential:

• The Synthetic Challenge: Hydrothermal synthetic amethyst shares identical chemical composition, refractive index, and specific gravity with natural quartz, and synthetic stones can even mimic color zoning.
• Diagnostic Testing: Gemological laboratories distinguish natural from synthetic amethyst using specialized polariscopes (checking for Brazil-law twinning, which occurs naturally during crystal growth but is absent in standard synthetic crystals) and Fourier-Transform Infrared Spectroscopy (FTIR) to inspect infrared absorption spectra.
• Our Amethyst: Every Amethyst at Ratna Gems is natural, untreated, earth-mined quartz, accompanied by an independent gemological testing report confirming natural origin.

Every Amethyst (Jamunia) stone sold by Ratna Gems is individually tested and comes with a report from an independent gem testing laboratory. The certificate identifies the mineral species as Natural Quartz, gemstone variety as Natural Amethyst, exact carat and ratti weight, dimensions, specific gravity (2.65–2.66), refractive index (1.544–1.553), hardness (7.0 on Mohs scale), and confirms untreated natural status. Each report carries its own report number, which you can quote to the laboratory to check it.

Lab Report Included: Every gemstone comes with a report from an independent gem testing laboratory at no extra charge. If you specifically require an additional report from GII, IIGJ, or IGI, you can select it from the certification dropdown on the product page (official laboratory testing fees apply in advance on a non-refundable basis).

With a Mohs hardness of 7.0 and no directional cleavage plane, Amethyst is a durable gemstone well suited for daily rings, pendants, and earrings:

• Scratch Resistance: At 7 on the Mohs scale, Amethyst is as hard as the quartz grains in ordinary dust, so it keeps its polish well with normal care.
• Cleaning: Clean safely with warm water, mild soap, and a soft-bristled brush or microfiber cloth. Avoid extreme boiling water or sudden thermal shock.
• Avoid Prolonged Sunlight: Like many natural iron-colored minerals, continuous prolonged exposure to intense, direct ultraviolet sunlight over months can cause slight color fading. Store your jewelry in a fabric-lined jewelry box when not in use.

For customers observing classical Indian customs, traditional literature outlines the following customary conventions:

• Customary Metals: Sterling Silver (925 Silver), White Gold, or traditional Panchdhatu / Ashta Dhatu alloys are traditionally considered the ideal setting for Jamunia.
• Traditional Placement: Customarily worn on the middle finger (Madhyama) of the working hand.
• Traditional Timing: Customary traditions often observe Saturday evenings during the waning moon (Krishna Paksha) or sunset.
• Traditional Role (Upratna): Commonly named in Indian practice as an Upratna (substitute) for Blue Sapphire (Neelam), associated with Saturn (Shani).