diamond 138Diamonds are formed when hh temperatures and pressures are applied to deep-sea carbon deposits (about 90 to 125 miles below the surface). The formation time of stones varies fromDiamond Aircraft Industries GmbH Nikolaus-August-Otto-Straße 5 2700 Wiener Neustadt, Austria DAI SI 42NG-138 Page 1 of 1 01-Feb-2025 SERVICE INFORMATION NO. SI 42NG-138 I