https://thegemindex.com/weekly1.0 https://thegemindex.com/gemstones/weekly0.9 https://thegemindex.com/locations/weekly0.9 https://thegemindex.com/gemstones/diamond/2026-08-15monthly0.8https://thegemindex.com/assets/images/gems/diamond/11ebbccfcd38874d04987ccafc01ee7e-hero.jpgDiamondA diamond is a natural carbon crystal formed deep within the Earth under extreme heat and pressure. Renowned as the hardest known natural substance on Earth, it features a brilliant adamantine luster and high light dispersion.https://thegemindex.com/gemstones/ruby/2026-08-15monthly0.8https://thegemindex.com/assets/images/gems/ruby/249588e3f2dee62c6b874a71484f9365-hero.jpgRubyA ruby is a pinkish-red to blood-red gemstone made of corundum (aluminium oxide). Chromium gives it its red color and strong red fluorescence. Ranking 9 on the Mohs hardness scale, it is exceptionally durable. Celebrated as the birthstone for July, top-quality natural rubies are among the most valuable colored gemstones in the world.https://thegemindex.com/assets/images/gems/ruby/4012a5a0b61329d8d9875781cbe86a94-hero.jpgRuby crystal — GeoDIL 1026Ruby (corundum) crystal, about 7 cm across, photographed for the Geoscience Digital Image Library. The source describes the specimen as from near Mysore, India; identity and locality wording follow that source record.https://creativecommons.org/publicdomain/zero/1.0/https://thegemindex.com/gemstones/blue-sapphire/2026-08-15monthly0.8https://thegemindex.com/assets/images/gems/blue-sapphire/11dae248c3a573f791e9b0fa8f896ee7-hero.jpgBlue SapphireA blue sapphire is a precious gemstone made of corundum, a mineral that scores 9 out of 10 on the Mohs hardness scale. Highly prized for its rich blue color, durability, and royal history, it is widely used in rings, necklaces, and fine jewelry.https://thegemindex.com/gemstones/emerald/2026-08-15monthly0.8https://thegemindex.com/assets/images/gems/emerald/1209563cba109c603a013bf5359adfb7-hero.jpgEmeraldAn emerald is a precious green gemstone made of the mineral beryl, colored by trace amounts of chromium or vanadium. Ranking 7.5 to 8 on the Mohs hardness scale, emeralds are the traditional birthstone for May and are prized for their rich green or bluish-green hues. https://thegemindex.com/locations/mogok-stone-tract/2026-08-15monthly0.7https://thegemindex.com/locations/montepuez-ruby-mining-area/2026-08-15monthly0.7https://thegemindex.com/locations/mozambique/2026-08-15monthly0.7https://thegemindex.com/locations/myanmar/2026-08-15monthly0.7