Black Friday jewelry deals on Amazon

Moissanite is silicon carbide, 9¼ on the Mohs scale, so studs take daily wear, and they need no sizing. When you compare sale prices, compare the same stone size and check how the weight is given: “2CT (1.0CT*2)” on one listing below means two 1 ct stones, while “1.60 Cttw” on another is the total for both earrings.

Look for

• “Moissanite” in the title, never just “diamond”
• Round stones, 4 to 6.5 mm each
• Carat weight per earring or for the pair: the title should say which
• 925 sterling silver or 14k solid gold, stated exactly
• Screw backs for everyday wear

Gugots moissanite studs, 4 mm, white gold plated sterling silverScrew backs; 0.6 ct for the pair (0.3 ct each), D colour, VVS1, per the listing.about $35on Amazon → SENOTSMEG moissanite studs, 1 ct each, rhodium-plated sterling silverPush backs; 2 ct for the pair, D colour, per the listing.about $14on Amazon → Gem Stone King moissanite studs, 6 mm, solid 14K white goldSolid 14K white gold; round 6 mm stones, 1.60 ct total, per the listing.about $200on Amazon →

A tennis bracelet is a whole line of stones, so the choice of stone moves the price most here, and moissanite keeps it low. Compare deals at the same stone size and length, because the total carat weight rises quickly with both.

Look for

• Round stones of one size, 3 to 4 mm, each in its own prongs
• Box clasp with a safety latch, or an adjustable slide clasp for a gift
• 925 sterling silver or solid gold, stated exactly
• Length: a snug wrist measurement plus about ½ inch (1.3 cm)

FANCIME moissanite tennis bracelet, 3 mm, 7 in, sterling silver5.3 ct total, D colour, VVS1, per the listing.about $220on Amazon → Gugots moissanite tennis bracelet, 4 mm, 7 in, white gold plated sterling silverS925 sterling silver, white gold plated; D colour, VVS1, per the listing.about $250on Amazon → TUHE adjustable moissanite tennis bracelet, 3 mm, white gold plated sterling silverAdjustable; 3.69 ct total, per the listing. Handy for a gift when you do not know the wrist size.about $130on Amazon →

Lab ruby and sapphire are corundum, hardness 9, the same mineral as mined stones. The US FTC’s jewelry guides say the gem name on a lab stone must come right after a word such as “laboratory-created” or “laboratory-grown”, so that word is the one to look for in a sale listing.

Look for

• “Lab-created”, “created” or “lab-grown” right before the gem name; “simulated” means an imitation
• 925 sterling silver or solid gold
• Stone size in millimetres
• Ring size, if it is a ring

B. BRILLIANT created blue sapphire studs, 4 mm, sterling silverRound 4 mm solitaire studs in 925 sterling silver, per the listing.about $25on Amazon → FANCIME created ruby tennis bracelet, 4 mm, 7.2 in, sterling silverCreated red ruby in sterling silver; 7.2 in long and 4 mm wide, per the listing.about $130on Amazon → PEORA created blue sapphire solitaire ring, 8 mm, sterling silver2.75 ct round in a cathedral setting, 925 sterling silver, per the listing. This link is the size 7 option.about $60on Amazon →

Lab-grown diamond is diamond, so the sale price buys the real material; what it cannot show you is the grade. The report is your proof, so look the number up when the studs arrive, inside the return window.

Look for

• “Lab-grown” or “lab-created” diamond in the title
• An IGI report named, with a number you can check on IGI’s website
• Carat weight per stone, or “ctw” for the pair
• 14k solid gold (stamped 585)
• Screw backs on the larger sizes

MAX + STONE lab-grown diamond studs, 1/4 ct total, 14K yellow goldIGI certified; 3 mm stones, 0.125 ct each, per the listing.about $95on Amazon → Amazon Essentials lab-grown diamond studs, 0.5 ct total, 14K white goldIGI certified; four prongs, G to H colour, VS1 to VS2, per the listing. Sizes from 0.25 to 1 ct are on the same listing.about $220on Amazon → Houston Diamond District lab-grown diamond studs, 2 ct, 14K white goldIGI certified; screw backs, E to F colour, VS1 to VS2, per the listing.about $890on Amazon →

The biggest purchase in a jewellery sale, so it is where checking pays: make sure the report matches the centre stone, and keep it, because Amazon asks for certificates of authenticity to come back with a return.

Look for

• Centre stone weight stated apart from the total weight
• An IGI report number for the centre stone
• 14k or 18k solid gold, or platinum
• Your ring size, measured before you order

LynChoe lab-grown diamond ring with side stones, 1 ct, 14K white goldIGI certified; side stones, 14K white gold, per the listing. This link is the 1 ct, size 9 option; choose your own size on the listing.about $670on Amazon → Houston Diamond District lab-grown diamond solitaire, 3 ct, 14K white goldIGI certified; four prongs, E to F colour, VS1 to VS2, per the listing. This link is the size 8 option.about $2,300on Amazon → Houston Diamond District lab-grown diamond ring, 2 ct, 14K yellow goldIGI certified, 2 ct, 14K yellow gold, per the listing. This link is the size 4.5 option.about $1,450on Amazon →

A chain has no stone to judge, so compare width, length and, for silver, the weight in grams. Under the US FTC’s jewelry guides “sterling” may only be used for silver at least 925 parts per thousand pure, so a sterling chain is silver alloy all the way through, not a plating; stainless steel gives a similar look, usually for less.

Look for

• “925 sterling silver” or “stainless steel” stated, not “alloy”
• Width in millimetres and length in inches
• Weight in grams on silver: more grams, more silver
• A lobster or box clasp

Miabella sterling silver Cuban chain, 3.2 mm, 24 inItalian 925 sterling silver, 19.1 g, per the listing.about $110on Amazon → QUADRI sterling silver Figaro chain, 5 mm, 20 in925 sterling silver, made in Italy, 10 g, per the listing.about $70on Amazon → ChainsHouse stainless steel Cuban chain, 7 mm, 20 inStainless steel, 7 mm wide, 20 in long, per the listing.about $30on Amazon →