A 2.5 carat opal can be anything from less than 200.00 to over 2,000.00. The value will depend on several things such as cut, and pattern.
you first must know the color of the Opal (i read this on a website called opal.com)
If someone was trying to obtain an Opal ring that was made with 14 carat gold they could purchase one at a jewelry store. Opal rings can also be purchased online through a variety of online stores.
There are many online jewelry retailers which sell fashion opal earrings. Some examples include Lyla Loves, JG Jewelers, Opal Mine, Opal Auctions, JE Gem and Johnston Opals.
Black Opals are rare. Depending on the size, oval shape, etc. the value of a black opal can be listed at approximately USD $1000 per carat.
If the opal has fire, play of color, it is used for jewelry. Very little gem quality opal is imported by the USA. Most of it goes to Asia. The white opal you are used to seeing in the stores is not considered gem quality in the trade. Gem quality opal can cost thousands of dollars a carat. Opal can be man made. It is produced for research to see if it can be more efficient in transmitting light than optic cable.
Black Opal sells only "African American" colored cosmetics. They sell them for your eyes, face, lips, and they even have a bunch of different types of accessories.
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.
One can purchase Lenox Opal Innocence dishes at several fine retailers. Macy's and Bed Bath and Beyond are a couple of places to find Lenox Opal Innocence dishes. Amazon and eBay also sell Lenox Opal Innocence dishes.
The stamp "JCR 10k" inside a ring indicates that the ring is made of 10 karat gold. Karat is a measure of the purity of gold, with 10 karat gold being 41.7% pure gold. The "JCR" may be the manufacturer's mark or hallmark.
The types of Opal that i am familiar with are White Opal, Fire Opal, Boulder Opal, Black Opal, Crystal Opal, Light Opal, Doublet Opal, Triplet Opal, Common Opal, Synthetic Opal, and Immitation Opal.
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.