Calculator Inputs
Example Data Table
| Item | Metal | Weight | Purity | Gem Input | Buyer Margin | Estimated Payout |
|---|---|---|---|---|---|---|
| Ring | 14K gold | 8 g | 58.333% | 0.40 ct at 600 | 12% | Compare with quote |
| Bracelet | Sterling silver | 35 g | 92.5% | No main stone | 18% | Mostly melt value |
| Pendant | Platinum | 12 g | 95% | 1.20 ct at 450 | 10% | Metal plus stone |
Formula Used
Gross grams = entered weight converted into grams.
Purity fraction = purity percent ÷ 100. For gold karat, purity percent = karat ÷ 24 × 100.
Pure troy ounces = gross grams × purity fraction ÷ 31.1034768.
Metal value = pure troy ounces × market rate per pure troy ounce.
Gem value = carats × price per carat × quality multiplier × (1 − treatment discount ÷ 100).
Gross estimated value = metal value + gem value + side stone value + design premium.
Final offer = gross estimated value − buyer margin − flat fees, then adjusted by market adjustment percent.
How To Use This Calculator
Enter the item name first. Choose the metal type and weight unit. Add the measured weight. Select karat for gold, or enter a custom purity percent. Add the current market rate per pure troy ounce. Enter gem details if stones are included.
Use the buyer margin field to model dealer spread. Add refining, assay, handling, and other fees. Use market adjustment for a premium or discount. Press submit to view the estimate above the form. Use CSV or PDF buttons to save the current result.
Article
Local Value Planning
Selling jewelry can feel rushed. A written estimate helps you slow down. This Tulsa Gold And Gem Calculator gives a structured view of metal melt value, stone value, buyer deductions, and final payable amount. It is not an appraisal. It is a planning aid for comparing offers.
Why This Calculator Helps
Gold and gems are priced from several moving parts. Metal weight matters first. Purity matters next. A heavy ring may contain less pure gold than expected. Stones need a separate line because their value depends on carat weight, quality, treatment, and demand. The calculator separates these parts so the estimate is easier to audit.
Metal Value Basics
The tool converts your chosen weight unit into grams. Then it converts grams into troy ounces. Precious metals normally trade by troy ounce. For gold, karat can set purity. For silver, platinum, or custom items, use the purity percentage field. The pure metal weight is multiplied by the market rate you enter.
Gem And Premium Inputs
Gem value is estimated from carats, price per carat, a quality multiplier, and any treatment discount. Side stones can be added as a single extra value. A design premium can also be included when a piece may sell above melt value. This is useful for branded, antique, or handmade items.
Deductions And Payouts
Dealers may subtract a margin, assay cost, refining cost, insurance cost, or other handling charges. These deductions are normal, but they should be visible. The calculator shows the gross value, total deductions, final offer, and payout rate by gram. You can change one input and compare the result quickly.
Using It Wisely
Weigh items accurately before using the form. Remove nonmetal parts when possible. Use recent spot prices from a trusted market source. Enter conservative gem prices when quality is uncertain. Keep printed or downloaded results for each buyer quote. A clear worksheet can help you ask better questions and avoid pressure.
Example Use Case
A seller may compare a 14 karat chain with a small diamond ring. Each item needs different assumptions. One may earn mostly from melt. The other may rely on stone quality. Separate lines make the estimate clearer. Save both results before negotiating any final offer.
FAQs
Is this calculator an official appraisal?
No. It is an estimate tool. A certified appraiser can inspect condition, authenticity, gemstone grading, brand value, and resale demand. Use this calculator to prepare before getting a professional opinion or buyer quote.
Which spot price should I enter?
Enter the current market rate for the pure metal. Use the rate that matches your metal type. Gold, silver, platinum, and palladium each have separate rates per troy ounce.
How does karat affect gold value?
Karat measures gold purity. Pure gold is 24 karat. A 14 karat item is about 58.333 percent gold. Lower karat means less pure metal value for the same gross weight.
Can I calculate silver or platinum items?
Yes. Choose the metal type and use the purity percent field. Sterling silver is often 92.5 percent. Many platinum jewelry pieces use 90 to 95 percent purity.
How should I estimate gem value?
Use carat weight and a realistic price per carat. Adjust the quality multiplier for cut, clarity, color, and demand. Add a treatment discount if the stone is enhanced or uncertain.
What is buyer margin?
Buyer margin is the spread kept by the dealer. It may cover risk, processing, resale time, and profit. A higher margin reduces your estimated payout.
Why are refining and assay fees included?
Some buyers charge for testing, melting, shipping, or refining. These costs reduce the final offer. Listing them separately makes the estimate easier to compare.
Why download CSV or PDF results?
Downloads help you keep a record. Save one result for each offer. You can compare buyer margins, fees, metal rates, and final payouts more clearly.