[[Micron]]-sized diamond crystals can be synthesized from a suspension of graphite in organic liquid at [[Standard conditions for temperature and pressure|atmospheric pressure and room temperature]] using ultrasonic [[cavitation]]. The diamond yield is about 10% of the initial graphite weight. The estimated cost of diamond produced by this method is comparable to that of the HPHT method; the crystalline perfection of the product is significantly worse for the ultrasonic synthesis. This technique requires relatively simple equipment and procedures, but it has only been reported by two research groups, and has no industrial use. Numerous process parameters, such as preparation of the initial graphite powder, the choice of ultrasonic power, synthesis time and the solvent, are not yet optimized, leaving a window for potential improvement of the efficiency and reduction of the cost of the ultrasonic synthesis.<ref name="sonication">{{cite journal|title =Experimental Corroboration of the Synthesis of Diamond in the Cavitation Process| doi= 10.1134/1.1710678|journal = Doklady Physics |volume= 49 |year =2004| pages= 150–153|issue=3|last1 =Galimov|first1 =É. M.|last2 =Kudin|first2 =A. M.|last3 =Skorobogatskii|first3 =V. N.|last4 =Plotnichenko|first4 =V. G.|last5 =Bondarev|first5 =O. L.|last6 =Zarubin|first6 =B. G.|last7 =Strazdovskii|first7 =V. V.|last8 =Aronin|first8 =A. S.|last9 =Fisenko|first9 =A. V.|bibcode = 2004DokPh..49..150G |last10 =Bykov|first10 =I. V.|last11 =Barinov|first11 =A. Yu.| s2cid= 120882885}}</ref><ref>{{cite journal|title =Graphite-to-diamond transformation induced by ultrasonic cavitation| doi= 10.1016/j.diamond.2008.01.112|journal=Diam. Relat. Mater.| volume= 17 |year= 2008| pages= 931–936|issue= 6|last1 =Khachatryan|first1 =A.Kh.|last2 =Aloyan|first2 =S.G.|last3 =May|first3 =P.W.|last4 =Sargsyan|first4 =R.|last5 =Khachatryan|first5 =V.A.|last6 =Baghdasaryan|first6 =V.S.|bibcode = 2008DRM....17..931K }}</ref>
