You can buy a diamond of this carat weight today on Blue Nile and spend between US$520 and US$4,187, depending on the clarity, colour and cut that you want.
One tenth of a carat is a small weight for a diamond -- your local jeweler may have such a diamond to sell.
Whatever you have to sell is worth whatever someone will pay you for it. Today, on Blue Nile, you can purchase such a diamond, and pay between US$686 and US$3,683, depending on the clarity, colour and excellence of the marquis cut.
Every diamond is valued according to its clarity, colour, cut and carat weight. You give the cut: marquise; the colour: I; and the carat weight: one, but the clarity is not stated in your question. Today, on Blue Nile, you can purchase such a diamond, and depending on the clarity that you want, and depending on the exact carat weight and pay between US$2,488 and US$7,435.
The price of any diamond depends greatly of its colour, purity, the existence of inclusions, and of course, the pressure of offer/demand.
One carat of diamond in a single diamond is worth more than multiple diamonds -- or chips in this case -- is worth. Any diamond is valued by its cut, colour, clarity and carat weight. Anything is worth whatever someone will pay you for it. You can take your chips to a jeweler who makes jewelery and sell them there.
Every diamond is worth what someone will pay you for it. Before you sell any diamond, regardless of its colour, pay for a certificate from a certified gemologist who will rate the diamond, according to its cut, colour, carat weight and clarity. Those details will help you establish a 'fair market value' for your diamond(s).
Based on the eight questions you asked -- all alternates -- you have a diamond ring that you want to sell. Your first job is to pay for a certification of the diamond and the setting. You can take it to a certified gemologist -- not a local jeweler for an appraisal -- who will document the quality of the stone according to its cut, clarity, carat weight and colour. With this information, you'll have a better idea of the value of the ring. Then, you can sell it privately, consign it, pawn it or sell it outright. (You can buy a 3-carat diamond today from Blue Nile and spend from US$22,000 to US$28,000.)
The value of a diamond depends on its cut, its clarity, its colour and its carat weight. You can buy a round, fairly high-quality stone today on Blue Nile in the 10-carat range (8 carat or 12 carat) and spend US$1.1 or US$1.2 million. A local jeweler may be able to show you the stone you want to buy. If you have a diamond of this size and want to sell it, best practices dictate that you pay for a certified gemologist to document the diamond's characteristics. This will help you establish a price for your diamond.
When selling a diamond, you can sell it for whatever a buyer will pay you for it. For a diamond of this weight, best practices dictate that you pay a certified gemologist to describe and value the diamond and the setting. Then, you'll have an idea of its worth. You can buy a diamond of this weight with no remarkable colour or clarity, depending on the cut, and pay from US$2,400 to US$3,300 today from Blue Nile.
Every diamond is valued individually according to its cut, colour, clarity and carat weight. In addition, whatever you have to sell is worth what someone will give you for it.
Your answer depends on why you are buying diamonds. As an investment, you can educate yourself as to the four Cs of diamond value: cut, clarity, colour and carat weight, and then buy the highest grade diamond with the heaviest carat weight that you can afford. As bling, you can forego everything above except carat weight and understand that the diamond is not an investment grade gem-stone and may not sell for as much as you paid for it. As industrial hardner, you can look for the size, grade and quantity that you want to buy.
Before you sell anything, best practices dictate that you fully understand the merits of what it is that you have to sell. If the diamond weighs more than one carat, it is worthwhile that you pay a certified gemologist to document the cut, colour, carat weight and clarity of the diamond. The certificate will also include the characteristics of the metal involved in the jewelery. This documentation will help you establish a fair market value for what you want to sell.