Ruby (man made, lab grown), Faceted, Round Cut, Calibrated (different sizes in mm), Worldwide Shipping These rubies are round cut stones. Each purchase is for one stone. These are man made, lab grown rubies (possessing a very similar chemical composition to natural rubies), hence the much lower price. For sale are man made rubies that originate from Thailand. These rubies have an almost identical chemical composition to earth mined, natural rubies with the exception that they have been generated (grown) in a lab using the Verneuil method. They have the same hardness, density, and overall appearance as their natural counterparts. This process This process involves dropping powdered chemicals through a high-temperature flame, where it melts and falls onto a rotating pedestal to produce a synthetic crystal. Chemical Composition: Al2O3 Crystal Structure : Hexagonal Purity : 99.99% Refractive Index : 1.717 Density : 3.98-4.1 g/cm3 Hardness Mohs : 9 Stone Details: Gem: Ruby (synthetic) Treatment: Heated to Improve Color Color: Pinkish Red Cut: Round Clarity: IF (AAA) (loupe clean) Total Weight: 0.25 carats - 5 carats (approximately) (depending on diameter in mm) Origin: Thailand *We sell fossils, gems, meteorites, and more, please visit our eBay store and browse our other listings.* THE ITEM(S) WILL BE SHIPPED OUT VIA STANDARD MAIL (USPS FIRST CLASS MAIL with tracking) (ESTIMATED SHIPPING TIME IS APPROXIMATELY 3-5 WORKING DAYS (DOMESTIC) AND 15-25 WORKING DAYS (INTERNATIONAL) DEPENDING ON COUNTRY AND LOCATION). THANK YOU FOR LOOKING. PLEASE FEEL FREE TO CONTACT US IF YOU HAVE ANY QUESTIONS OR SPECIAL ORDER REQUESTS. THANK YOU.