Natural Bi-Color Tourmaline Gemstone - Lab Certified from GemsMantra is a 100% genuine, earth-mined/natural loose gemstone sourced from Brazil (Minas Gerais Pegmatite Deposit). Each stone is individually inspected by qualified gemologists for natural crystal structure, optical properties, and color uniformity, and ships with an independent gemological laboratory authenticity report.

Gemological Specifications

• Mineral Species: Natural Elbaite/Dravite Complex Borosilicate Tourmaline
• Gemstone Variety: Natural Bi-Color Pink-Green Elbaite Tourmaline
• Origin: Brazil (Minas Gerais Pegmatite Deposit)
• Color & Appearance: Distinct Natural Rose-Pink to Forest-Green Crystal Color Zoning
• Shape & Cut: Octagonal Step / Rectangular Cushion Faceted Cut
• Treatment Disclosure: 100% Unheated & Untreated Natural Color Zoning
• Refractive Index: 1.624 - 1.644
• Specific Gravity: 3.02 - 3.12
• Mohs Hardness: 7.0 - 7.5
• Carat-to-Ratti Conversion: Standard Indian Gemological Scale where 1 Ratti = 0.90 Carat (Available calibrated weights: 4.25 Ratti (3.83 Carat), 5.25 Ratti (4.73 Carat), 6.25 Ratti (5.62 Carat), 7.25 Ratti (6.53 Carat), 8.25 Ratti (7.42 Carat), 9.25 Ratti (8.33 Carat), 10.25 Ratti (9.22 Carat))
• Lab Certification: Authenticated by an ISO-certified independent gemological testing laboratory (verifying natural origin, species, variety, weight, and optical constants; physical report card included in box)
• Mounting Options: Available as an unmounted Loose Gemstone, Adjustable Panchdhatu Ring (+Rs.0 FREE on loose stones >=Rs.15,000; +Rs.500 under Rs.15,000), 925 Sterling Silver Ring (+Rs.2,999), or 925 Sterling Silver Pendant (+Rs.2,499), plus live 9KT/14KT/18KT BIS Hallmarked Gold Ring customisation on page.

GemsMantra Zero-Risk Assurance & Custom Ring Studio

• 100% Natural Certified Gemstone: Guaranteed 100% earth-mined natural gemstone formation (never glass-filled, dyed, or artificially manufactured).
• QR-Verifiable Lab Report: Authenticated by an ISO-certified independent gemological testing laboratory with a physical QR-verifiable Lab Report card shipped inside every box.
• 4-Hour 3-Real-Stone WhatsApp Video Selection: Within 4 hours of booking (Prepaid or Partial Token), our gemologist desk shares natural daylight videos and QR lab certificates of 3 real in-stock stones in your selected Ratti weight on WhatsApp so you approve your exact piece prior to dispatch.
• Free Adjustable Panchdhatu Ring on >=Rs.15,000: Complimentary custom Adjustable Panchdhatu Ring (+Rs.0 FREE on loose stone orders >=Rs.15,000; +Rs.500 below Rs.15,000), plus custom Hallmarked 925 Sterling Silver Ring (+Rs.2,999) and 925 Sterling Silver Pendant (+Rs.2,499).
• Dynamic 9KT/14KT/18KT BIS Hallmarked Gold Ring Studio on Page: Configure live weight-calibrated 9KT, 14KT, or 18KT BIS Hallmarked HUID Gold Rings (R3-R30 Vedic open-back skin-touch CAD designs) directly in the interactive Gold Ring Studio on the product page, with Snapmint Pay Later / Cardless Installments supported at checkout.
• 80% Lifetime Upgrade Value: Backed by GemsMantra's 80% Lifetime Upgrade Value privilege toward any higher-value certified natural gemstone upon presenting your original tax invoice and lab certificate.