Release Date:  February 17, 2005    Contact:  Craig A. Creaturo
                                              Chief Financial
                                              Officer and Treasurer
                                              (724) 352-4455
                                              ccreaturo@ii-vi.com
                                              Homepage:  www.ii-vi.com





                       II-VI INCORPORATED DECLARES
                      TWO-FOR-ONE COMMON STOCK SPLIT

PITTSBURGH, PA.,  February 17, 2005  -- II-VI Incorporated (NASDAQ NMS:
IIVI) announced today that its Board of Directors declared a two-for-one
stock split of the Company's common stock in the form of a 100% common
stock dividend.  The common stock dividend will be issued to shareholders
of record as of the close of business on March 2, 2005.  II-VI expects
that its transfer agent, American Stock Transfer and Trust Company, will
distribute the dividend on or about March 22, 2005.  There are currently
approximately 14.6 million shares of II-VI common stock outstanding.
Upon completion of the stock split, there will be approximately 29.2
million common shares outstanding.

Carl J. Johnson, chairman and chief executive officer of II-VI
Incorporated stated, "Today's stock split reflects our continued
commitment to building value for our shareholders and demonstrates the
confidence of our Board of Directors and management in both the
fundamentals and growth potential of our business.  In addition, the
split is intended to further improve our liquidity and to make our shares
more accessible to institutional and individual shareholders."

Headquartered in Saxonburg, Pennsylvania, II-VI Incorporated designs,
manufactures and markets optical and opto-electronic components, devices
and materials for infrared, near-infrared, visible light, x-ray and
gamma-ray instrumentation.  The Company's infrared optics business
manufactures optical and opto-electronic components sold under the II-VI
brand name and used primarily in CO2 lasers.  The Company's near-infrared
optics business manufactures near-infrared and visible light products for
industrial, scientific, military and medical instruments and laser gain
materials and products for solid-state YAG and YLF lasers at the
Company's VLOC subsidiary.  The Company's military infrared optics
business manufactures infrared products for military applications under
the Exotic Electro-Optics (EEO) brand name.  In the Company's Compound
Semiconductor Group, the eV PRODUCTS division manufactures and markets
solid-state x-ray and gamma-ray sensor products and materials for use in
medical, industrial, environmental, scientific and homeland security
applications; the Company's Wide Bandgap Materials (WBG) group
manufactures and markets single crystal silicon carbide substrates for
use in the solid-state lighting, wireless infrastructure, RF electronics
and power switching industries; Marlow Industries, Inc. designs and
manufacturers thermoelectric cooling and power generation solutions for
use in defense, space, photonics, telecommunications, medical, consumer
and industrial markets.

This press release contains forward-looking statements based on certain
assumptions and contingencies that involve risks and uncertainties.  The
forward-looking statements are made pursuant to the safe harbor
provisions of the Private Securities Litigation Reform Act of 1995 and
relate to the Company's performance on a going-forward basis.  The
forward-looking statements in this press release involve risks and
uncertainties, which could cause actual results, performance or trends,
including the above mentioned anticipated revenues and earnings, to
differ materially from those expressed in the forward-looking statements
herein or in previous disclosures.  The Company believes that all
forward-looking statements made by it have a reasonable basis, but there
can be no assurance that management's expectations, beliefs or
projections as expressed in the forward-looking statements will actually
occur or prove to be correct.  In addition to general industry and
economic conditions, factors that could cause actual results to differ
materially from those discussed in the forward-looking statements in this
press release include, but are not limited to: (i) the Company's ability
to successfully integrate Marlow's operations into the Company's
organization and to realize synergies in material growth and utilization
of our worldwide manufacturing and distribution networks (ii) the failure
of any one or more of the assumptions stated above to prove to be
correct; (iii) the risks relating to forward-looking statements and other
"Risk Factors" discussed in the Company's Annual Report on Form 10-K for
the fiscal year ended June 30, 2004; (iv) purchasing patterns from
customers and end-users; (v) timely release of new products, and
acceptance of such new products by the market; (vi) the introduction of
new products by competitors and other competitive responses; and/or (vii)
the Company's ability to devise and execute strategies to respond to
market conditions.

CONTACT:  Craig A. Creaturo, Chief Financial Officer and Treasurer of II-
VI Incorporated, 724-352-4455, or e-mail, ccreaturo@ii-vi.com.

                                  # # # #