Your 30th anniversary is a gem of a celebration day with both gemstones being the gift item for both the traditional and modern anniversary gift lists. Jewelry and gemstones aren't the requisite gift though. Using the modern and traditional 30th anniversary gift ideas as guidelines, you can come up with some incredibly creative and romantic 30th anniversary gifts.
30th Anniversary Flower: Sweet Pea 30th Anniversary Gemstone: Pearl Jubilee
30th Anniversary Traditional Gifts: Pearl
Pearls are a hard gift for men, but pearl cufflinks would work well.
Give her an oyster with a real pearl inside. Many place sell these as a kit that comes with a chain to create a beautiful necklace as well.
A Pearl Bailey CD for the music buff.
The movie Pearl Harbor on DVD for the movie buff.
Any pearl jewelry would work well as a gift for this anniversary.
30th Anniversary Modern Gifts: Diamond
Give him a watch encrusted with diamonds for him, though this wood work for her as well.
Give him diamond cufflinks.
Any other diamond jewelry for him or her would work well for this anniversary.
30th Anniversary Romantic Ideas
Take a 30-day cruise together.
Give her 30 roses (or whatever flower you used in your wedding) to celebrate 30 years.
Relive the past. Re-watch your wedding video, look at your wedding album together, and reflect on the last two years.
Match the number of gifts to your anniversary: Give him/her thirty small gifts for the thirtieth anniversary.