There will be total lunar eclipses on December 21 (2010), June 15 (2011), and December 10 (2011). Solar Eclipses (shadow of the Moon partially or fully blocking the Sun) can occur two to five times a year, but the majority are partial eclipses. Total eclipses occur about once every 18 months, and affect a very limited area. The maximum coverage of the solar disk lasts between 6 and 7.5 minutes.
1 Quarter carat or less diamond, $125 to $500 set in 14 carat gold. 2  0.3 to half carat diamond, $750 to $1,000 set in 18 carat gold or platinum, possibly more if ASG/GIA certified.  For diamonds up to 0.75 carat, or smaller ASG/GIA certified stones, $1,000-$2,000.
Carat per carat high quality emeralds are close to diamonds One carat equals one fifth of one gram Always think in terms of cost-per-carat. Emeralds under 1/2 carat are sold by millimeter, not by the carat. A carat is a carat. One carat equals one-fifth of one gram. This does not mean, however, that carats cost the same. Larger stones tend to carry a higher per-carat cost due to the scarcity of top quality emeralds in bigger sizes. Therefore, it is a good idea to think in terms of price per carat, rather than total cost. A couple other tips concerning weight: Beware of Total weight price tags.