The cost of a 1-carat opal can vary widely depending on factors such as the type of opal, its quality, and color. On average, prices can range from $30 to several hundred dollars per carat for common opals, while high-quality precious opals, particularly those with vibrant color play, can cost anywhere from $200 to over $1,000 per carat. Additionally, unique opals with rare characteristics can command even higher prices. Always consider purchasing from reputable sources to ensure quality.
2 dollars
1 carat = 200mg
About $800
1 carat = 0.2 grams
$15.00/carat minmum to $200/carat depends on quality of the gemstone
1 carat equals .2 grams
Black opal can be very expensive, only low grade black opal is sold by kilo weight. This low grade is called potch and colour which means that maybe bit of colour might be in this rough black opal I have seen parcels sold for $200 per kilo but it has no colour. Good kilo bucket of rough black opal would cost around $5,000 .00 Black opal is rated by body tone N1 for deep black colour, and N4 for light black colour. So for $5000 per kilo, dont expect N1 body tone. Black opal is sold by carat, and rare patterns are worth $5,000 to $20,000 per carat; especially red fire harlequin pattern n1 body tone, and over brighness rating of 4.
1 Carat = .2 grams = 100 points
Given the high number of diamonds limited by the low carat weight in your question, the cost of the diamonds might not be so much a factor as the quality of the setting into which they are mounted. The clarity quality that you describe wouldn't be so visible in diamonds weighing less than a quarter carat (.25 carat) each.
A diamond is valued by its cut, clarity, carat weight and colour. A local jeweler may be able to give you a precise answer, given more information about the stone.
200 mg
A round GIA certified 1 carat H color and VS1 clarity “VG†cut diamond is worth approx. $4,500. You can go down on clarity up to SI2 but an eye clean diamond which will cost you $3,800.