Zircon

Zircon is an important gemstone of many colors, and is an historical gemstone used for thousands of years. It is sometimes looked upon as a cheap Diamond simulant, but in actuality it can be a valuable gem. 

Its color diversity is caused by traces of certain impurities, some of which are radioactive. Zircon gemstones containing radioactive element traces undergo a process called metamiction, in which their inner crystal structure becomes destroyed. These radioactive forms of Zircon must be heated to stabilize them for use as gems. In fact, many of the gem forms of zircon (even those that are not radioactive) are heat treated to enhance color and increase transparency.

The radioactivity in Zircon gemstones is very minimal and is generally believed to be safe, without posing any health hazards.

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Currencies
1 x QZ031 Pear Cabochon 100ct 41x26x16mm Birds Carving Natural Inner Moss White Quartz1 x AQ115 Oval Cabochon 2.55ct 11x8.5x3.5mm Natural Unheated Light Greenish Blue Cat's Eye Aquamarine, Brazil1 x RG099 Big Orange Pink Natural Crystal Rutilated Kunzite (Spodumene) 46.18Ct1 x SS109 Oval Cabochon 4.67ct 10.5x8.5x4.3mm Natural 6 Rays Black Star Sapphire, Thailand1 x RS007 Oval Fancy Cabochon 4.65 Ct Natural Untreated Star Ruby Pinkish Red1 x SE001 Oval 2.04Ct 8.5x7.5mm Yellowish Green SPHENE (Titanite), Madagascar1 x AT110 VVS Pear Cut 5.61ct 14x10mm Natural Pink Purple AMETHYST Brazil1 x SL008 Antique Facet 2.00ct Natural Unheated Untreated Silver Pink SPINEL Tanzania1 x SX001 VVS Natural Oval Banded Red Orange Africa Sardonyx 8.39cts1 x TZ004 Scissor-Cut 2.92Ct 9x6.5mm Natural Unheated Untreated Multi-Color TANZANITE1 x AQ111 Oval 4.40ct 12.8x9x6mm Natural Unheated Sky Blue Aquamarine, Brazil1 x EM092 Certified Oval cabochon 1.38ct 8x5.5mm Natural Green EMERALD, Colombia Good Color1 x CT115 Certified VS Octagon 8.13ct 13x10x7mm Natural Medium Orangey Yellow Citrine, Brazil1 x AXD103 Oval Cabochon 0.98ct 6.19x4.59x3.15mm Natural Green Cat's Eye Alexandrite, Madagascar1 x PS103 Pear Cabochon 22ct 20x34x5mm Natural Unheated Untreated Chatoyant Pietersite, Africa1 x AQ011 Oval Cabochon 5.04Ct Natural Untreated Sky Blue AQUAMARINE Cat's Eye, Good Color1 x DD015 GIA Certified 0.26ct Princess Diamond Cut 3.7x3.6mm 0.26ct F Color Natural Diamond1 x GD003 Oval 4.7x3.3mm 0.42ct Horsetail Signature Natural Green Demantoid Garnet1 x TS099 Unheated Top Emerald Green Tsavorite Garnet 0.96Ct1 x CT197 VVS Round 3.35ct 10mm Natural Unheated Untreated Medium Orangey Yellow Citrine1 x BL110 VS Cushion 3.03ct 9x6mm Natural Unheated Golden Yellow Beryl Brazil1 x RG005 Unheated Natural Vivid Blue Kyanite Rough 21.15Ct1 x SS004 Oval Cabochon 2.10ct 9x7mm Natural Unheated White Star Sapphire 6 Rays Mogok1 x SP006 Unheated Untreated Natural Blue Sapphire Ceylon Srilanka 0.76Cts1 x AQ098 Natural Aquamarine Cat's Eye Lite Greenish Blue 11.25ct1 x SS611 Oval Cabochon 6.18ct 10.7x7.5mm Natural Unheated Light Blue 6 Rays Star Sapphire, Ceylon1 x MG110 Oval 1.33ct 9x6.5x3.6mm Natural Unheated Pinkish Orange Morganite Brazil1 x AA005 Natural Single Cut White diamonds Round 1.2mm1 x AP117 Cushion 1.38ct 6.5mm Natural Unheated Paraiba-Color Neon Blue Apatite Brazil1 x TP079 Lot 1.38Ct 80Pcs VS Natural White TOPAZ 1.5mm Round Diamond Cut1 x AA100 Lot 20pcs Round Facetted 2.25mm Natural Black Spinel1 x AG199 Pear Cabochon 50ct 36x22x8mm Natural Unheated Untreated Seaweed Moss Agate1 x GH099 2.80ct 9x7mm Octagon Natural Untreated Orange HESSONITE GARNET Africa1 x CV116 Natural Orange Sandstone Guanyin Carving 10.24ct 21x14x7mm, Brazil1 x KP005 Semi Round Cabochon 1.50ct 7x6.7x3.6mm Natural Green Kornerupine Cat's Eye, India