Gem & Jewelry Laboratory
Standardized carat measurements, karat alloy gold purity calculations, Troy ounce precious metal valuations, and historic UK assay hallmark decoding.
1. Gemstone Shape & Specific Gravity
2. Physical Dimensions (mm)
3. Estimated Carat Weight & Aspect Ratio
Explore Additional Utilities
Likert scale ↔ numerical score
Convert Likert scale responses (e.g., 3-point, 5-point, 7-point, 10-point) into standardized numerical indices for survey research analytics.
Superfat percentage — excess oil ↔ skin conditioning level
Calculate excess unsaponified superfat oils and skin-conditioning moisture metrics.
Speed to fly — polar curve ↔ McCready interthermal speed
Calculate the optimum speed to fly between thermals based on the glider polar curve, expected next thermal climb rate, and headwind/sink.
Solar heat gain coefficient ↔ shading factor
Convert Solar Heat Gain Coefficient (SHGC) to Shading Coefficient (SC) for solar radiation control.
Nectar ↔ honey — volume reduction during curing
Calculate volume and weight reduction as bees dehydrate raw floral nectar (80% moisture) down to cured honey (18% moisture).
Lye calculator — oil weight ↔ NaOH ↔ KOH amount
Determine exact NaOH and KOH weights required for cold and hot-process soap formulation batches.
Cure time — soap thickness ↔ days to harden
Forecast recommended bar cure durations and hardening rates based on shape profile dimensions.
Water discount — full water ↔ reduced water ratio
Optimize water discount levels and water-to-lye concentration ratios to speed up soap curing.
Mohs Hardness & Scratch Resistance
Compare minerals, absolute hardness values, and scratch interactions using the classic 1-10 Mohs scale and Knoop indentation hardness.
Pipe Flow Rate Calculator
Calculate water flow rate, velocity, and capacity under gravity or pressurized nozzle flow.
Fabric Width Yardage Converter
Convert fabric yardage requirements between different standard widths like 44 inches and 60 inches.
Jewel count ↔ movement quality indicator
Explore movement bearing counts from 1 to 30+ jewels. See where rubies are placed and how they reduce mechanical friction.
Thread length — stitch count ↔ thread needed
Calculate thread length needed for saddle stitching based on stitch line length, leather thickness, and spacing density.
Troy ounce ↔ gram ↔ pennyweight
Convert weights of precious metals like gold, silver, and platinum between Troy ounces, grams, and pennyweight (dwt).
Frequency ↔ Wavelength (Sound)
Convert between sound frequency and wavelength in air or water, considering temperature and medium sound speed variations.
Sidereal Time Converter
Convert between standard Solar Time and Sidereal Time based on your longitude.
Mortar mix ratio — cement ↔ sand ↔ water by weight
Calculate standard masonry mortar mix classes (Type M, S, N, O, K) and determine precise cement, sand, and water weights.
IPv4 ↔ decimal ↔ binary — IP address formats
Translate standard dot-decimal IPv4 addresses to raw decimal integers and 32-bit binary representations.
Chisel bevel angle — degrees ↔ sharpening guide setting
Calculate chisel bevel angles and determine the exact projection distance needed for hone sharpening guides.
Dimensional Weight ↔ Chargeable Weight
Calculate shipping dimensional weight based on L x W x H using standard carrier factors, and determine final chargeable weight.