2008-04-11 23:24:41 -

- Rubicon Technology, Inc. (Nasdaq:RBCN), a leading provider of sapphire substrates and products to the LED, Semiconductor, and Optical industries, will report financial results for the first quarter ended March 31, 2008 on Thursday, April 24th, 2008 before the market opens.

In conjunction with the release, management will host a conference call at 7:30 a.m. CDT on April 24th

to review the financial results. To participate in the conference call, please dial (888) 680-0892 or (617) 213-4858 (international) at least 10 minutes prior to the start of the call. Callers will need to reference conference ID 15266794.

You may also pre-register online for the conference call at: www.theconferencingservice.com/prereg/key.process?key=PR7AUX7QY

The conference call will also be webcast live over the Internet and can be accessed at the company's website: www.rubicon-es2.com/index.html.

An audio replay of the call will be available approximately two hours after the conclusion of the call. The audio replay will remain available until 11:59 p.m. May 8, 2008 and can be accessed by dialing (888)-286-8010 or (617) 801-6888 (international). Callers should reference conference ID 80275930. The webcast will be archived on the Company's website.

About RBCN: Rubicon Technology, Inc. is an advanced electronic materials provider that is engaged in developing, manufacturing and selling monocrystalline sapphire and other crystalline products for light-emitting diodes (LEDs), radio frequency integrated circuits (RFICs), blue laser diodes, optoelectronics and other optical applications. The Company applies its proprietary crystal growth technology to produce very high-quality sapphire in a form that allows for volume production of various sizes and orientations of substrates and windows. Rubicon is a vertically-integrated manufacturer with capabilities in crystal growth, high precision core drilling, wafer slicing, surface lapping, large-diameter polishing and wafer cleaning processes, which the Company employs to convert the bulk crystal into products with the quality and precision specified by its customers. The Company is actively developing larger diameter products to support next-generation LED, RFIC and optical window applications.

Further information is available at www.rubicon-es2.com.

Rubicon Technology, Inc.
William Weissman
Chief Financial Officer
847-457-3610