A diamond that measures 12mm by 10mm in an oval cut can weigh in the neighborhood of five carats.
Your diamond is worth whatever someone will pay you for it. Today on Blue Nile, you can purchase a diamond close to this carat weight and pay between US$4,579 and US$5,165, depending on the exact carat weight and the quality of its cut.
The price depends on the colour, cut, clarity and carat weight of the stone. A local jeweler can show you a stone of this size and quote you a price.
TMT bar oval weight Stand oval size in mm like 12mm size bar oval size-12*.8=9.6kg/m
The diamond weighs one carat. Its other dimensions depend on its cut: round, princess, emerald and so forth. A carat is 0.2 grams; a pure diamond has a density of 3.5 gm cm-3 which translates to a volume of 0.057 cm3 per carat. As stated in the first answer the linear dimensions depend on the shape that is cut.
The cut itself is not an indicator of gem-stone price. The excellence of the cut may affect the price. The cut of a diamond stone is determined by the diamond cutter in order to preserve the other best qualities of the raw stone, such as colour, clarity or carat weight.
It depends on the shape. For e.g. a 1 carat round brilliant diamond has a width of 6,5 mm. Other shapes, such as a marquise diamond is cut to be a longer shape. A one carat marquise diamond would be about 10 mm x 4,75 mm. Oval, pear and emerald along with the marquise shape visually appear larger than the round and square shapes.
According to web site www.brilliancejewelry.com a 6x8mm OVAL cut Tanzanite it is approximately 1.35ct.
A jeweler can give you the exact measurements of this diamond when seen in person, which will be between 9.5 x 7.5 mm (2 carats) and 10.0 x 8.0 mm (3 carats).
Any diamond is 'worth' what someone will pay you for it. If you have such a diamond, best practices dictate that you pay a certified gemologist for a certificate describing and valuing the gem. You can purchase a diamond of this weight, colour and clarity grade, depending on the cut and pay from US$9.900 to US$12,600.
The 28-year-old Prince used the dazzling oval blue 18-carat sapphire and diamond ring when he popped the question while they were on holiday in Kenya last month.
Chansey evolves from an Oval Stone.
Hapinny