Sight-unseen it is not possible to give you a precise answer.
Every diamond is valued according to its colour, clarity, carat weight and cut. A local jeweler may be able to give you a range of prices that the jeweler would pay you for the stones.
Finally, appreciate that whatever you have to sell is worth whatever someone will pay you for your goods.
The value of 1.45 carats of diamonds will depend on weather you have one single diamond or more. Do you have 145 diamonds with a total weight of 1.45 carats or 2 0.5 carat diamonds and a 0.45 carat diamond? Large diamonds are many many times more valuable than small ones and a single 1.45 carat diamond will be worth far more than tree diamonds with a total carat weight of 1.45 carats
No, because they are too heavy. The only rock that will sometimes float on water is pumis. Although, you may coat small (roughly 1mm diameter) diamonds in pine oil and then they will float. They are presently using a process called froth flotation to remove diamonds from gangue minerals at a mine called EKATI in canada. Diamonds are naturally hydrophobic, you just need them to be small enough so that the force exerted by the surface tension outweighs the force applied by gravity.
The value will depend upon the quality of the diamonds. You will need to get a jeweller to look at the ring. Diamonds are valued on more than just size, their colour ( shade of white) and clarity ( for example ) are important too.
Well, they are woth something, the specific answer being specific to the individual piece of jewelry. In general, larger diamonds are rarer and thus more valuable, so a cluster containing larger diamonds is generally worth more per carat than one with smaller diamonds, and not as much as one single diamond of that same weight. Diamonds really need to be over a carat in weight before they have a significant resale value. Most places that buy inexpensive clusters from the public will probably offer 100.00 a carat or less.
Diamonds are very hard, so they don't wear or blunt much when drilling through softer materials.
diamonds
Diamonds grossed $81,897 worldwide.
Diamonds grossed $81,897 in the domestic market.
By weight, diamonds are worth more because they are much more rare than gold.
It depends on how much money you have
Diamonds Are Forever grossed $116,000,000 worldwide.
Ocean's Eleven grossed $450,728,529 worldwide.
Diamonds Are Forever grossed $43,800,000 in the domestic market.
Ocean's Eleven grossed $183,417,150 in the domestic market.
How much money dmx worth
Because they are relatively rare and hard to mine. They also have aesthetic value in jewelery as well as intrinsic value in various types of industrial machinery (although much of the latter is now replaced by synthetic diamonds).
You should insure your diamonds from the diamond place you got it from. You should ask them how much the insurance is. It will probably cost you a couple hundred dollars but it is worth it. Be aware that you will not get the money for the ring if you loose it but the company may replace the ring.